Exclusive to Mace Engineering is our design-registered plenum spacer to suit Holden Ecotec 3.8L V6 engines.

What is a plenum spacer and what does it do?

A plenum spacer thermally separates the plenum cover and intake manifold. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result there is less of a pressure drop inside the plenum chamber between cylinders, and less air momentum, resulting in better air distribution and power. The change in airflow characteristics is shown in the diagram below.

Not only will our spacer help you make more power, it will also help prevent any costly rebuilds through dangerous lean outs that occur due to poor air distribution with standard manifolds in high horsepower/boost applications.

In addition to improving air distribution between cylinders, the increase in plenum volume also has a positive effect on bottom end torque.

The fact these spacers are manufactured from the same thermal resistant composite material as our manifold insulators means further horsepower gains are possible due to the reduction in heat soak. 

Key Benefits:

• Design registered.
• Reduces charge air temperature resulting in better power consistency and detonation prevention.
• Power increase with no undesirable side effects.
• Improved air distribution between each cylinder.
• Improved fuel economy.
• Easy to install.
• Can be used as a replacement gasket.
• Reusable.
• Proven gains at an affordable price.

Contents:

• 1 X Plenum spacer
• 1 X Bolt pack
• 1 X Silicone gasket maker

Vehicle Fitment Guide

Parts Guide

Please select the part number you require from the drop down menu by utilising our vehicle fitment guide and parts guide.

Notes: 

• The 25mm plenum spacer is recommended for turbo or supercharged applications only.
• Installation is very straight forward, requiring only the removal of your plenum cover to install the plenum spacer.

Exclusive to Mace Engineering is our design-registered plenum spacer to suit Holden Ecotec 3.8L V6 engines.

What is a plenum spacer and what does it do?

A plenum spacer thermally separates the plenum cover and intake manifold. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result there is less of a pressure drop inside the plenum chamber between cylinders, and less air momentum, resulting in better air distribution and power. The change in airflow characteristics is shown in the diagram below.

Not only will our spacer help you make more power, it will also help prevent any costly rebuilds through dangerous lean outs that occur due to poor air distribution with standard manifolds in high horsepower/boost applications.

In addition to improving air distribution between cylinders, the increase in plenum volume also has a positive effect on bottom end torque.

The fact these spacers are manufactured from the same thermal resistant composite material as our manifold insulators means further horsepower gains are possible due to the reduction in heat soak. 

Key Benefits:

• Design registered.
• Reduces charge air temperature resulting in better power consistency and detonation prevention.
• Power increase with no undesirable side effects.
• Improved air distribution between each cylinder.
• Improved fuel economy.
• Easy to install.
• Can be used as a replacement gasket.
• Reusable.
• Proven gains at an affordable price.

Contents:

• 1 X Plenum spacer
• 1 X Bolt pack
• 1 X Silicone gasket maker

Vehicle Fitment Guide

Parts Guide

Please select the part number you require from the drop down menu by utilising our vehicle fitment guide and parts guide.

Notes: 

• The 25mm plenum spacer is recommended for turbo or supercharged applications only.
• Installation is very straight forward, requiring only the removal of your plenum cover to install the plenum spacer.

Exclusive to Mace Engineering is our design-registered plenum spacer kit to suit Holden SIDI LLT 3.6L V6 engines.

What is a plenum spacer and what does it do?

A plenum spacer thermally separates the plenum cover and intake manifold. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result there is less of a pressure drop inside the plenum chamber between cylinders, and less air momentum, resulting in better air distribution and power. The change in airflow characteristics is shown in the diagram below.

Not only will our spacer help you make more power, it will also help prevent any costly rebuilds through dangerous lean outs that occur due to poor air distribution with standard manifolds in high horsepower/boost applications. 

In addition to improving air distribution between cylinders, the increase in plenum volume also has a positive effect on bottom end torque.

The fact these spacers are manufactured from the same thermal resistant composite material as our manifold insulators means further horsepower gains are possible due to the reduction in heat soak. 

• Design registered.
• Reduces charge air temperature resulting in better power consistency and detonation prevention.
• Power increase with no undesirable side effects.
• Improved air distribution between each cylinder.
• Improved fuel economy.
• Easy to install.
• Can be used as a replacement gasket.
• Reusable.
• Proven gains at an affordable price.​​

Contents:

• 1 X Plenum spacer 
• 1 X Bolt pack (Not included in MI630, refer to parts guide) 
• 1 X Silicone gasket maker
• 4 X Spacer bush

Vehicle Fitment Guide

Parts Guide

Please select the part number you require from the drop down menu by utilising our vehicle fitment guide and parts guide.

Note: Installation is very straight forward, requiring only the removal of your plenum cover to install the plenum spacer.

Exclusive to Mace Engineering is our design-registered plenum spacer kit to suit Holden SIDI LLT 3.6L V6 engines.

What is a plenum spacer and what does it do?

A plenum spacer thermally separates the plenum cover and intake manifold. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result there is less of a pressure drop inside the plenum chamber between cylinders, and less air momentum, resulting in better air distribution and power. The change in airflow characteristics is shown in the diagram below.

Not only will our spacer help you make more power, it will also help prevent any costly rebuilds through dangerous lean outs that occur due to poor air distribution with standard manifolds in high horsepower/boost applications. 

In addition to improving air distribution between cylinders, the increase in plenum volume also has a positive effect on bottom end torque.

The fact these spacers are manufactured from the same thermal resistant composite material as our manifold insulators means further horsepower gains are possible due to the reduction in heat soak. 

• Design registered.
• Reduces charge air temperature resulting in better power consistency and detonation prevention.
• Power increase with no undesirable side effects.
• Improved air distribution between each cylinder.
• Improved fuel economy.
• Easy to install.
• Can be used as a replacement gasket.
• Reusable.
• Proven gains at an affordable price.​​

Contents:

• 1 X Plenum spacer 
• 1 X Bolt pack (Not included in MI630, refer to parts guide) 
• 1 X Silicone gasket maker
• 4 X Spacer bush

Vehicle Fitment Guide

Parts Guide

Please select the part number you require from the drop down menu by utilising our vehicle fitment guide and parts guide.

Note: Installation is very straight forward, requiring only the removal of your plenum cover to install the plenum spacer.

Exclusive to Mace Engineering is our design-registered plenum spacer kit to suit Holden SIDI LLT 3.6L V6 engines.

What is a plenum spacer and what does it do?

A plenum spacer thermally separates the plenum cover and intake manifold. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result there is less of a pressure drop inside the plenum chamber between cylinders, and less air momentum, resulting in better air distribution and power. The change in airflow characteristics is shown in the diagram below.

Not only will our spacer help you make more power, it will also help prevent any costly rebuilds through dangerous lean outs that occur due to poor air distribution with standard manifolds in high horsepower/boost applications. 

In addition to improving air distribution between cylinders, the increase in plenum volume also has a positive effect on bottom end torque.

The fact these spacers are manufactured from the same thermal resistant composite material as our manifold insulators means further horsepower gains are possible due to the reduction in heat soak. 

• Design registered.
• Reduces charge air temperature resulting in better power consistency and detonation prevention.
• Power increase with no undesirable side effects.
• Improved air distribution between each cylinder.
• Improved fuel economy.
• Easy to install.
• Can be used as a replacement gasket.
• Reusable.
• Proven gains at an affordable price.​​

Contents:

• 1 X Plenum spacer 
• 1 X Bolt pack (Not included in MI630, refer to parts guide) 
• 1 X Silicone gasket maker
• 4 X Spacer bush

Vehicle Fitment Guide

Parts Guide

Please select the part number you require from the drop down menu by utilising our vehicle fitment guide and parts guide.

Note: Installation is very straight forward, requiring only the removal of your plenum cover to install the plenum spacer.

Exclusive to Mace Engineering is our design-registered plenum spacer kit to suit Holden SIDI LLT 3.6L V6 engines.

What is a plenum spacer and what does it do?

A plenum spacer thermally separates the plenum cover and intake manifold. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result there is less of a pressure drop inside the plenum chamber between cylinders, and less air momentum, resulting in better air distribution and power. The change in airflow characteristics is shown in the diagram below.

Not only will our spacer help you make more power, it will also help prevent any costly rebuilds through dangerous lean outs that occur due to poor air distribution with standard manifolds in high horsepower/boost applications. 

In addition to improving air distribution between cylinders, the increase in plenum volume also has a positive effect on bottom end torque.

The fact these spacers are manufactured from the same thermal resistant composite material as our manifold insulators means further horsepower gains are possible due to the reduction in heat soak. 

• Design registered.
• Reduces charge air temperature resulting in better power consistency and detonation prevention.
• Power increase with no undesirable side effects.
• Improved air distribution between each cylinder.
• Improved fuel economy.
• Easy to install.
• Can be used as a replacement gasket.
• Reusable.
• Proven gains at an affordable price.​​

Contents:

• 1 X Plenum spacer 
• 1 X Bolt pack (Not included in MI630, refer to parts guide) 
• 1 X Silicone gasket maker
• 4 X Spacer bush

Vehicle Fitment Guide

Parts Guide

Please select the part number you require from the drop down menu by utilising our vehicle fitment guide and parts guide.

Note: Installation is very straight forward, requiring only the removal of your plenum cover to install the plenum spacer.

Our plenum spacer sits between the plenum and plenum cover. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result, there is less of a pressure drop inside the plenum chamber between cylinders and less air momentum. This, in turn, feeds each intake runner more evenly improving throttle response and bottom end torque.

The change in airflow characteristics is shown in the diagram below.

Not only will our spacer help you make more power, it will also reduce air-fuel ratio variance between cylinders due to improved air distribution between cylinders. This is particularly important with engines running an aggressive tune or in boosted setups, as it reduces the likelihood of detonation.

As it is also manufactured from the same thermal resistant material as our manifold insulators, further horsepower gains and more consistent power output is achieved due to the reduction in air temperature. 

Contents:

• Manifold plenum spacer
• Mounting hardware
• Gasket maker

Key Benefits:

• Provides better air distribution between cylinders
• Produces a cooler charge air temperature
• Improves low end torque by increasing plenum volume
• Better fuel economy
• Reusable over and over again
• No undesirable side effects
• DIY Installation

Vehicle Fitment Guide

Parts Guide

Please select the part number you require from the dropdown menu by utilizing our fitment guide and parts guide.

Notes: 

• Installation is very straight forward, only requiring the removal of the plenum cover to install the plenum spacer.
• The 8mm spacer is generally suited for vehicles running a factory or aftermarket strut brace. The 12mm spacer will have clearances issues with these setups. Due to variances between vehicles, it is important to check the clearance between the plenum and the strut brace before purchasing.

Our plenum spacer sits between the plenum and plenum cover. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result, there is less of a pressure drop inside the plenum chamber between cylinders and less air momentum. This, in turn, feeds each intake runner more evenly improving throttle response and bottom end torque.

The change in airflow characteristics is shown in the diagram below.

Not only will our spacer help you make more power, it will also reduce air-fuel ratio variance between cylinders due to improved air distribution between cylinders. This is particularly important with engines running an aggressive tune or in boosted setups, as it reduces the likelihood of detonation.

As it is also manufactured from the same thermal resistant material as our manifold insulators, further horsepower gains and more consistent power output is achieved due to the reduction in air temperature. 

Contents:

• Manifold plenum spacer
• Mounting hardware
• Gasket maker

Key Benefits:

• Provides better air distribution between cylinders
• Produces a cooler charge air temperature
• Improves low end torque by increasing plenum volume
• Better fuel economy
• Reusable over and over again
• No undesirable side effects
• DIY Installation

Vehicle Fitment Guide

Parts Guide

Please select the part number you require from the dropdown menu by utilizing our fitment guide and parts guide.

Notes: 

• Installation is very straight forward, only requiring the removal of the plenum cover to install the plenum spacer.
• The 8mm spacer is generally suited for vehicles running a factory or aftermarket strut brace. The 12mm spacer will have clearances issues with these setups. Due to variances between vehicles, it is important to check the clearance between the plenum and the strut brace before purchasing.

Our plenum spacer sits between the plenum and plenum cover. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result, there is less of a pressure drop inside the plenum chamber between cylinders and less air momentum. This, in turn, feeds each intake runner more evenly improving throttle response and bottom end torque.

The change in airflow characteristics is shown in the diagram below.

Not only will our spacer help you make more power, it will also reduce air-fuel ratio variance between cylinders due to improved air distribution between cylinders. This is particularly important with engines running an aggressive tune or in boosted setups, as it reduces the likelihood of detonation.

As it is also manufactured from the same thermal resistant material as our manifold insulators, further horsepower gains and more consistent power output is achieved due to the reduction in air temperature. 

Contents:

• Manifold plenum spacer
• Mounting hardware
• Gasket maker

Key Benefits:

• Provides better air distribution between cylinders
• Produces a cooler charge air temperature
• Improves low end torque by increasing plenum volume
• Better fuel economy
• Reusable over and over again
• No undesirable side effects
• DIY Installation

Vehicle Fitment Guide

Parts Guide

Please select the part number you require from the dropdown menu by utilizing our fitment guide and parts guide.

Notes: 

• Installation is very straight forward, only requiring the removal of the plenum cover to install the plenum spacer.
• The 8mm spacer is generally suited for vehicles running a factory or aftermarket strut brace. The 12mm spacer will have clearances issues with these setups. Due to variances between vehicles, it is important to check the clearance between the plenum and the strut brace before purchasing.

Our plenum spacer sits between the plenum and plenum cover. Its main purpose is to improve air distribution between cylinders by slowing down the air speed inside the plenum chamber. As a result, there is less of a pressure drop inside the plenum chamber between cylinders and less air momentum. This, in turn, feeds each intake runner more evenly improving throttle response and bottom end torque.

The change in airflow characteristics is shown in the diagram below.

Not only will our spacer help you make more power, it will also reduce air-fuel ratio variance between cylinders due to improved air distribution between cylinders. This is particularly important with engines running an aggressive tune or in boosted setups, as it reduces the likelihood of detonation.

As it is also manufactured from the same thermal resistant material as our manifold insulators, further horsepower gains and more consistent power output is achieved due to the reduction in air temperature. 

Contents:

• Manifold plenum spacer
• Mounting hardware
• Gasket maker

Key Benefits:

• Provides better air distribution between cylinders
• Produces a cooler charge air temperature
• Improves low end torque by increasing plenum volume
• Better fuel economy
• Reusable over and over again
• No undesirable side effects
• DIY Installation

Vehicle Fitment Guide

Parts Guide

Please select the part number you require from the dropdown menu by utilizing our fitment guide and parts guide.

Notes: 

• Installation is very straight forward, only requiring the removal of the plenum cover to install the plenum spacer.
• The 8mm spacer is generally suited for vehicles running a factory or aftermarket strut brace. The 12mm spacer will have clearances issues with these setups. Due to variances between vehicles, it is important to check the clearance between the plenum and the strut brace before purchasing.