E-cutouts and H pipe

Mopar Exhaust Systems

  1. Steve009

    Steve009 FBBO Gold Member FBBO Gold Member

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    can anyone tell me where to install electronic cutouts in the exhaust? Should they go before or after the H pipe? Is there a recommended distance from the collector or does it not matter? Easiest for me would be after the H pipe which is a few feet from the collector.
     
  2. 493 Mike

    493 Mike FBBO Gold Member FBBO Gold Member

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    Steve,
    I believe cutout placement should mimic headers with collector extensions, so a close to header position would be preferred. I put mine right at the crossmember, ahead of my X-pipe. The difference the cutouts made (3"system, dumping ahead of axle) was 20 HP on Steve Morris' chassis dyno. I have been disappointed in Flowmasters since then.
    Mike
     
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    • 1967coronet440

      1967coronet440 Well-Known Member

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      You gained 20hp on the chassis dyno with cutouts? That's pretty impressive.
       
    • Zeppelin264

      Zeppelin264 Well-Known Member

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      Running Flowmasters, I'm not surprised. They restrict so much flow.

      Dynomax is the move!
       
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      • Steve009

        Steve009 FBBO Gold Member FBBO Gold Member

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        dammit it have flowmasters... guess im leaving the cutouts open! haha
         
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        • 440beep

          440beep FBBO Gold Member FBBO Gold Member

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          I have my QTP cutouts located in the reducer before the H-pipe. So it goes header/reducer-cutout/H-pipe.

          I have Flowmasters too, but really really want Magnaflows. Dynomaxs are too sleepy FOR ME.
           
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          • RobP

            RobP Well-Known Member

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            I have my QTP's right after my x-pipe for clearance reasons.
             
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            • loganlane68

              loganlane68 Well-Known Member

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              Did you happen to dyno before and after the H pipe?Just wondering how much difference the H pipe makes. Thanks
               
            • Steve009

              Steve009 FBBO Gold Member FBBO Gold Member

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              It more just gets rid of that drone sound when on the highway. There is a good episode of engine masters that compares straight to H to X pipes.

              For better fitting I ended up going headers, reducers, cutouts, H-pipe, then mufflers in that order.
               
            • Rod A.

              Rod A. Active Member

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              Any negative comments on using Borla mufflers on my 440 69 GTX. Im looking for an aggressive muscle car sound. Was also thinking about series 10 flowmasters, but cant find anyone around me running them. The videos ive seen/heard on YouTube dont tell me anything. Recording sounds using a cell phone just don't do sound justice. Im also doing a complete new 3" exhaust system with my cutouts before the cross over pipe. Does an H pipe really cut down on the resonance inside the car? I dont mind loud, but I cant stand that drone!!! Right now Im running old school woodpecker glass packs!!!
              Please be tactful in your response!! :lol:
               
            • Steve009

              Steve009 FBBO Gold Member FBBO Gold Member

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              H and X pipes really do help with drone. the difference between the X and the H are minimal but are definitely an improvement in sound over 2 straight pipes.



              I think with a 3" exhaust it will sound badass whether you use flowmasters or dynomax (quieter). magnaflows are loud as hell and have this weird tinny sound in my opinion especially when revs are coming down. my choice is flowmaster all the way.
               
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