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Thread: Custom exhaust diameter help.

  1. #1
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    Custom exhaust diameter help.

    I'm going to have a local shop Fab up a stainless exhaust with e dual center exit. My question is what diameter tubing should I go for? What would give the best sound? I am installing an ATP 3' downpipe Tuesday and I'm pretty sure it tapers down to a 2.5' to connect to the stock exhaust. Should I do 2.5, 2 3/4, or even 3 inch? What are your suggestions?

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    Stock turbo, 2.5 would be plenty imo

    oem catback exhaust is 2.25 at its biggest point and much smaller in some sections.
    2015 Abarth (auto) moonroof, leather, Beats, forged 17s
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    595 grey badges, door handles, carbon fiber door sills
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    EBC slotted rotors & redstuff pads
    Chrome scorpion gas door
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    EC phase 0 & phase 2
    EC 4.1 version intake
    EC FMIC and piping
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    Quote Originally Posted by All Bark View Post
    Stock turbo, 2.5 would be plenty imo

    oem catback exhaust is 2.25 at its biggest point and much smaller in some sections.
    Would a larger diameter help fade out some of the rasp from the catless downpipe?

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    Doubt it. A bigger pipe made my cracks and pops a little less violently, firework sounding. It basically took off some of the edge of the CRACK sound, but it still has them, just slightly less explosive sounding on the high end, sound wise, if that makes any sense to you.

    I doubt it’ll do anything regarding the rasp from the removal of the cat, you’ll either have to re-fit a converter or use a resonator to eliminate or mitigate the rasp, pipe size won’t do much if anything to change rasp from eliminating a restriction/muffling device further up stream, which is what you’re doing when going catless, sound wise.
    2015 Abarth (auto) moonroof, leather, Beats, forged 17s
    Blackout oem headlight, taillight & turn signal package
    595 grey badges, door handles, carbon fiber door sills
    Neu-F springs, 28mm torsion bar, Koni yellows (rear)
    Neuspeed 2.5 inch full catback exhaust
    EBC slotted rotors & redstuff pads
    Chrome scorpion gas door
    Shrader rear seat delete
    EC phase 0 & phase 2
    EC 4.1 version intake
    EC FMIC and piping
    Sila turbo blanket
    Defi boost gauge
    Black roof wrap
    HID headlights
    GFB DV+
    4C coils
    Tinted

  5. #5
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    Ok boss. Thanks for all the information.

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