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The best Catted downpipe?
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Thread: The best Catted downpipe?

  1. #1
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    The best Catted downpipe?

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    Which Catted downpipe would you recommend?
    My main goal is to increase power without ruining the cars beautiful exhaust note. Catless are out of the question for me. Too loud and too raspy for me.

    I'm on the fence between:

    RRM catted downpipe

    Or

    ATP catted downpipe

    I plan on getting a Tork tune soon. I called the guys at Tork and they recommended a better intake, GFB diverter valve+ and a better downpipe for the best bang for my buck. I already have the first two and just need help deciding on the downpipe. The rest of the car is stock.

    If anyone can share personal experiences with the way they sound and behave it would be much appreciated!

  2. #2
    Mikeyjm1's Avatar
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    I just ordered one of these since I’m about to go full 2.5”.

    https://corsaforzaperformance.com/sh...verter-flange/

    $40 and I’ll have the shop making my B pipe, weld it on.
    16’ 500X Pop, Rosso, 1.4T/M6, 18” O.Z. 45th Anniversary wheels, H&R springs, Momo shift knob, MPX Throttle Body, Magnaflow (Renegade) cat-back...

    13’ 500 Abarth, Bianco, M5,
    17”, Koni shocks, Eibach Prokit, CFP Hats, ES/EC bumpstops and seats, Powerstop rotors and pads. (Wife's)

    95’ Wrangler, Aqua, 4.0/Auto,
    33” on 15x8”, 4” lift, too much to list here (Also Hers)

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    Would that make a noticeable improvement in flow mated to a stock exhaust? I was under the impression that the high flow catalyst was what made the biggest difference.

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    Mikeyjm1's Avatar
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    I’m going with not popping a CEL. Lol. But the stock cat is like 3” and the flange cuts it down to 1.8”. So matching the new exit to my soon to be 2.5” exhaust should be a huge difference.
    16’ 500X Pop, Rosso, 1.4T/M6, 18” O.Z. 45th Anniversary wheels, H&R springs, Momo shift knob, MPX Throttle Body, Magnaflow (Renegade) cat-back...

    13’ 500 Abarth, Bianco, M5,
    17”, Koni shocks, Eibach Prokit, CFP Hats, ES/EC bumpstops and seats, Powerstop rotors and pads. (Wife's)

    95’ Wrangler, Aqua, 4.0/Auto,
    33” on 15x8”, 4” lift, too much to list here (Also Hers)

  5. #5
    Moderator map's Avatar
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    That's a good idea, especially if your stock cat is in good condition.

    There are some threads on preferred cats.
    http://www.fiat500usaforum.com/showt...tos-amp-Video)

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    Quote Originally Posted by warthogdrifter View Post
    Would that make a noticeable improvement in flow mated to a stock exhaust? I was under the impression that the high flow catalyst was what made the biggest difference.
    Yes. I have the 2.5” CFP flange on OEM cat with stock exhaust. It made a noticeable difference in power by itself. A Neu-f or Magnaflow exhaust would mate up nicely. Exhaust sound also is a little louder and deeper now.

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    Mikeyjm1 (05-12-2020)

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    Modern Cats don’t flow that bad but a restriction like that sudden pinch from 3” to 1.8” is like hitting a wall.

    https://www.tercelreference.com/terc...st_theory.html

    I used this paper in my research before starting to purchase parts. It’s a great read. Turbo exhausts are very different animals.
    16’ 500X Pop, Rosso, 1.4T/M6, 18” O.Z. 45th Anniversary wheels, H&R springs, Momo shift knob, MPX Throttle Body, Magnaflow (Renegade) cat-back...

    13’ 500 Abarth, Bianco, M5,
    17”, Koni shocks, Eibach Prokit, CFP Hats, ES/EC bumpstops and seats, Powerstop rotors and pads. (Wife's)

    95’ Wrangler, Aqua, 4.0/Auto,
    33” on 15x8”, 4” lift, too much to list here (Also Hers)

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    Pilothall (05-13-2020)

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    Senior Member aelfwyne's Avatar
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    The ATP high flow is the best one you can buy pre-made. Several vendors offer it. Often you have to look for the ATP Catless, and the high flow is an option after that. However, ANY high flow cat has a very high risk of throwing a CEL, and spacers/mini cats are not a fix. Don't let anyone lie to you to sell you a part. You will throw a CEL with any high flow cat on these cars.

    It's better quality than the RRM pipe and actually costs less than the RRM. Plus RRM has had a lot of customer service issues the last couple of years.

    I've had the ATP high flow on my Abarth for several years now and have been very happy with it.
    2015 Rosso Abarth - MAD FIAT - 5 Speed - Phase 2
    2015 Granito Lucente 500T - Proyecto Estupido (Salvage) - Auto - OFT Stage 1

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    NGEN (05-12-2020)

  12. #9
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    ATP sounds like the clear winner. The more and more I look into it ATP always seems to be the consensus. I almost want to try the flange though... For $40 and probably ~$10 for the weld it looks like the definition of bang for your buck! Looking at this pic I found the flange would make the OEM a real winner. You guys said it gave the exhaust some more volume also? I love the factory note, but if I could just crank it up some I would be all over that.

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    i was just in this boat very recently, and from talking to several people that know their stuff with these cars i also got a clear answer..every single one answered the same--just get the cheaper one. the atp one is just as good as the rrm. i just ordered mine 2 days ago after deciding between those 2 dp's

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