| Product no.: MI601 |  | 
          
            | Exclusive to Mace Engineering, here we have our design-registered lower manifold insulator to suit the Holden VS and VT series, fitted with an Ecotec L36 3.8L 6 cylinder engine. | 
          
        
       
      
     
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           Number of ratings: 13
        Average rating: 4.9 
        
        
        
        
          
            
              
              
                
                
                
              
            
            Worth the money. Cheap mod with many benefits.
            
              from Jake on 2/8/2020
            
          
          
            Straight away noticed how much better the old vs powered through the hills in places it used to struggle. 
Idle seems to be better, no surging anymore.
And the torque is a bonus, definitely eliminates the ecojet lag.
Also the plenum is a hell of a lot cooler, no longer does my commodore struggle on hot days.
          
         
        
        
        
          
            
              
              
                
                
                
              
            
            Excellent - It works!
            
              from Anonymous on 5/20/2015
            
          
          
            Note: My car is VYII Series 2 with factory LPG (vaporized)..
Instant improvement, off the mark from low rpm there is more torque, loaded trailer towing is so much easier. 
I'm in NZ, this is my 2nd purchase from Mace Engineering who make me feel as though I'm a local, brilliant service. :)
Will be back for more as the wife allows...
          
         
        
        
        
          
            
              
              
                
                
                
              
            
            Great - Does what it says
            
              from Anonymous on 2/16/2015
            
          
          
            So I was sceptical... I really thought how could this thing make any difference to the performance. Understanding the runner length increase being how it would work I thought I'd give them a go not expecting much.
Well bugger me if they didn't work really well. There is an increase in torque down low in the rev range, it does seem to pull harder.
If like me you are sceptical, give it a go. You will be happy.
          
         
        
        
        
          
            
              
              
                
                
                
              
            
            Great value for money
            
              from Anonymous on 1/20/2014
            
          
          
            Fitted this along with plenum cover spacer and got results as description says, not using as much throttle as before, noticeable increase in pickup, easy install too!
          
         
        
        
        
          
            
              
              
                
                
                
              
            
            AAA
            
              from Anonymous on 10/30/2012
            
          
          
            This product is worth purchasing, can feel the extra power. Thanks
          
         
        
        
        
          
            
              
              
                
                
                
              
            
            Highly recommended
            
              from Anonymous on 9/11/2012
            
          
          
            Considerable notice in performance AAA+
          
         
        
        
        
          
            
              
              
                
                
                
              
            
            Excellent
            
              from Anonymous on 8/5/2012
            
          
          
            You can feel the difference in the heat below and above after going hard on the engine.
          
         
        
        
        
          
            
              
              
                
                
                
              
            
            great product
            
              from Anonymous on 6/15/2012
            
          
          
            Easy to install + helpful hints from the mace team = great car
          
         
        
        
        
          
            
              
              
                
                
                
              
            
            Great Product! Noticeable Power Gain!
            
              from Anonymous on 4/17/2012
            
          
          
            
          
         
        
        
        
          
            
              
              
                
                
                
              
            
            Very good
            
              from Anonymous on 2/9/2012
            
          
          
            
          
         
        
        
        
          
            
              
              
                
                
                
              
            
            Excellent a must have !!
            
              from Anonymous on 11/28/2011
            
          
          
            Much cooler temps on the intake. You can now touch the intake and leave your hand on it. Must be at least 20 deg cooler!!! Very well made part it fitted perfectly!! Every thing you needed to do the install was provided along with very good instructions on line!!
          
         
        
        
        
          
            
              
              
                
                
                
              
            
            very good
            
              from Anonymous on 10/23/2011
            
          
          
            my rev rang and power deliver is pretty good it smooth and very east fitting and also the plenum spacer is good very good with my fuel making good power out of my vy ecotec sadan :) :)
          
         
        
        
        
          
            
              
              
                
                
                
              
            
            top shelf product! definitely recommended
            
              from Anonymous on 9/20/2011
            
          
          
            my rev range and power delivery is smooth. Fairly simple fitting and online fitting instructions were in depth. This as well as the 12mm plenum spacer has improved fuel economy and combined with the other mods I've gotten from mace, I'm making some good power out of my ecotec vs ute :)