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    Thread: Exhaust Tech -- Best Method to Kill Rasp?

    1. Banned SimpleStaple's Avatar
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      Jetta VI 2.5L
      10-01-2012 12:42 PM #1
      So currently, I have a full-custom header back exhaust and am suffering rasp right at the peak of each gear. Currently, I am running the following setup, in order.

      1. OBX Header (EuroJet Design) with titanium wrap and silicone coating
      2. 2.5" Cat-Less mid pipe with custom 'branch' O2 spacers
      3. 2.5" Magnaflow resonator (12" length)
      4. 2.5" Magnaflow Muffler (12" total length as well)
      5. Non-resonated rolled exhaust tips


      Currently, I was looking into just putting an ultra-high-flow cat in the mix, going with an either 100 cell or 200 cell setup (2.5" as well, of course) to help, but was hoping I could get some additional ideas and feedback before I being dumping $$ to make things perfect.

      Should I just start with highly resonated tips and go from there?

    2. 10-02-2012 09:07 AM #2
      I'm running a longer res and a shorter muffler with the high flow cat that comes with the ej header. I only get rasp when the engine is cold.

    3. Member TylerO28's Avatar
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      '08 2.5Turbo Rabbit
      10-02-2012 03:37 PM #3
      You'll probably benefit from a14" resonator and maybe a 200 cell cat. Depends really on what you want. It can't be mellow and loud, can't be quiet and throaty. It's kind of finding that balance. I have the Eurojet exhaust and no cat and have zero rasp...but i also have the best muffler anyone can buy...the turbo...

      Many people find test pipe plus Eurojet to be raspy, and they use a14" Res and muffler... So get a high flew cat and it'll prob be perfect

      Sent from the bottomless pits of HELL!
      god i love my car. it may not be fast, but it's crazy fun!



      C2 stage 2 TURBO!!! ACHTUNG!!! 2.5liter 5cylinder contents under pressure!!!

    4. Banned SimpleStaple's Avatar
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      10-02-2012 04:12 PM #4
      Quote Originally Posted by TylerO28 View Post
      You'll probably benefit from a14" resonator and maybe a 200 cell cat. Depends really on what you want. It can't be mellow and loud, can't be quiet and throaty. It's kind of finding that balance. I have the Eurojet exhaust and no cat and have zero rasp...but i also have the best muffler anyone can buy...the turbo...

      Many people find test pipe plus Eurojet to be raspy, and they use a14" Res and muffler... So get a high flew cat and it'll prob be perfect

      Sent from the bottomless pits of HELL!
      Yeah, the 200 cell is what I was leaning towards.

      Def going to order one up soon. Thanks for your $.02!

    5. Member TylerO28's Avatar
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      '08 2.5Turbo Rabbit
      10-02-2012 05:27 PM #5
      No prob.let us know how it goes. Hope it cuts down on the buzz

      Sent from the bottomless pits of HELL!
      god i love my car. it may not be fast, but it's crazy fun!



      C2 stage 2 TURBO!!! ACHTUNG!!! 2.5liter 5cylinder contents under pressure!!!

    6. Member Rabbit_2.5's Avatar
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      07 Rabbit a.k.a Thumpr
      10-03-2012 12:07 PM #6
      A longer resonator would do the trick as well. I'm still running the stock exhaust manifold but I have a catless midpipe running into a 24" resonator to a 14" turbo muffler (Imco is the brand) with a twin exit double wall tip. It's not loud but people notice if i get on it and not even a hint of rasp up to 7200.
      Tornado Red 2007 VW Rabbit |C2 SRI|C2 SRI Software|Custom 2.5" Manifold-Back Exhaust|FK Streetlines|BFI Stage 2 Transmission Mount|ES Dogbone Insert|
      |42DD Shifter Bushings|

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