How restrictive is the stock exhaust?

Discussion in 'Fiesta ST Engine Upgrades' started by moff3tt, May 28, 2015.

  1. moff3tt

    moff3tt Active Member

    I cannot find a definitive answer. I know it is not a very large diameter pipe but our turbos are pretty small. Has anyone cut open the stock muffler or resonator? I am just trying to figure out exactly what I NEED to buy to get the most for my money.
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  3. Chuckable

    Chuckable Member

    Not sure where you are with your mods, but best bang for your buck is a tune, followed by either intercooler or downpipe, then probably intake and exhaust. You could also try calling Cobb or Mountune, or checking with Deadhook, 2J Racing, Modbargains, etc., or any of the highly modded cars on the forum. Mountune has always been very responsive and willing to talk when I had questions before purchasing their parts.
  4. moff3tt

    moff3tt Active Member

    I have an ATP downpipe and intercooler. I am running the COBB OTS stage 2 93 octane tune (since 93 is available in my area) (in a month and a half I'll get a proper tune for my setup) and was just curious since the stock downpipe is obviously a huge restriction. I am planning on getting a 2jr cowl intake, and cp-e rear mount next, but I wanted some hard evidence either way to say if I NEED an exhaust.
  5. Chuckable

    Chuckable Member

    Any advice I'd have would be based upon what I read or heard. Best bet is to talk to your tuner. Let us know how it turns out!
  6. moff3tt

    moff3tt Active Member

    Yeah that seems to be the case with everyone. Nobody has really done a cross-section of the stock exhaust. Just part companies trying to sell something (of course they're going to say that you need it).
  7. m4ximusprim3

    m4ximusprim3 Member

    Anecdotally, one of the guys in SD has a FiST with a catless DP. He had it going into a 2.5" cat-back system with magnaflow muffler (I think stock is 2.25" if i'm not mistaken). He then jumped to a 3" cat back and after an updated tune got definite butt-dyno improvements.

    That's about the most definitive statement I've heard - if you're already catless, then there might be some benefits to going bigger. If you have the stock dp, all you'll get is more noise (which might be worth it anyways).

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