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Thread: Diameter of stock Abarth exhaust.... 1.8"??? (and some tips on tips)

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    shagghie's Avatar
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    Diameter of stock Abarth exhaust.... 1.8"??? (and some tips on tips)

    Weird, so I was just out measuring the end diameter of our stock exhaust (2013 Ab), and was able to measure the diameter of the pipe sections after the 'T' that splits to each exhaust tip. To my surprise, the diameter was only between 1.75 and 1.80 inches. Eyeballing it from the side with a straight-edge ruler, I eyeballed 1.75".
    Thinking it must be an optical illusion, I grabbed a tape measurer, and wrapped it around the circumference and got about 5.75", which divided by π (pie) = 1.83".
    I thought we had a 2" pipe from cat back?

    Also for those curious and thinking about alternative exhaust tips, make sure you take a close look at what's going on. The 'T' split pipes done line up with the OEM exhaust tip openings in the rear diffusor correctly. To compensate, the factory actually puts a 1" bend in the exhaust tips to get them to line up with the diffusor openings, and to make it worse, the L and R sides are both different in the 'approach' of these pipes (not symmetrical). Put another way, adding after-market tips will require removing the outer 4" metal pieces that are welded onto the inner 2" pipes, and then re-using the 'straight' portion of those inner 2" pipes to attach your after market tips to, and even then, you have to hope those inner pipes of our stock tips are actually pointed straight ...eyeballing them, it appears as though the Left tip inner pipe doesn't even make its way through the outer 4" portion of the tip in a straight fashion!

    But back to my sanity check question: is our piping after the T split REALLY only ~1.8" diameter?? #wow. Makes me want to measure upstream of the T split too...which I wasn't able to do tonight in the dark, under a lowered car.
    http://www.fiat500usaforum.com/image.php?type=sigpic&userid=509&dateline=14328366  62
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    Berliner (05-30-2013)

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    Senior Member Abarth Five O's Avatar
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    Doesn't surprise me. Get rid of it and at least upgrade to R/R's rear axle exhaust w/ 2.25" dia. w/ 4" beautiful SS Magnaflow tips. You'll eliminate a lot of restriction from the OEM piece and immediately feel more HP gain; plus the exhaust note is greatly enhanced and only 10% louder.
    Last edited by Abarth Five O; 05-30-2013 at 01:23 AM.
    2012 Abarth Grigio: visit my garage for list of mods and more pics: http://www.fiat500usaforum.com/dto_g...vehicle&v=1754

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    shagghie's Avatar
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    Quote Originally Posted by Abarth Five O View Post
    Doesn't surprise me. Get rid of it and at least upgrade to R/R's rear axle exhaust w/ 2.25" dia. w/ 4" beautiful SS Magnaflow tips. You'll eliminate a lot of restriction from the OEM piece and immediately feel more HP gain; plus the exhaust note is greatly enhanced and only 10% louder.
    Someone's been doing his homework! :-) I'm waiting on the megan cat-back system... the prototype on Scorpion King's car is just PHOOOKING amazing sounding in person... just like the stock abarth, but MOAR, and a lot more pissed off too. really crazy actually...
    http://www.fiat500usaforum.com/image.php?type=sigpic&userid=509&dateline=14328366  62
    RAW Big Turbo, tuned to 250+whp on p93
    LSD, FX400, Okadas, 550cc, ported t-mani
    NightOwl Racing BC Racing with SWIFT Spring Suspension set up
    ATM FMIC, ATM Fenderwell Intake
    VanHook CF Rear Diff, doorhandles, hood vents and duct covers
    Advan RSII 17x7.5, rally stud conversion

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    All of this explains my signature. Italian cars have their fair share of...shall we say, design quirks?

    One would of thought after seeing the exhaust layout end result, someone with some juice at Fiat would have responded, "ah...no fellas....clean that mess up."

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    Senior Member Abarth Five O's Avatar
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    Quote Originally Posted by shagghie View Post
    Someone's been doing his homework! :-) I'm waiting on the megan cat-back system... the prototype on Scorpion King's car is just PHOOOKING amazing sounding in person... just like the stock abarth, but MOAR, and a lot more pissed off too. really crazy actually...
    Look forward to seeing more on the Megan CB exhaust and other systems coming on board.
    2012 Abarth Grigio: visit my garage for list of mods and more pics: http://www.fiat500usaforum.com/dto_g...vehicle&v=1754

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    Senior Member zonker's Avatar
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    We're talking pipe diameter from the cat back?

    1.8"?

    My 500 Pop used 2"

    My 500T pipe is larger than the Pop so 2.25"? 2.5"

    And the main pipe on the T and Abarth are the same diameters I believe, so unless you're talking about after the Abarth y pipe, then two 1.8" pipes will outflow the single 2.5" pipe upstream so there's no restriction to worry about, and probably no power to gain either by going larger (other than sound and "street cred")

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    whatebahw (06-01-2013)

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    I am thinking about buying the Madness Exhaust. Does anybody have any F/b on it? I guess the Stock Abarth Exhaust will be a great Piece of Art hanging on my Garage Wall. 1.8 Inches no wonder it takes me so long from Zero to 100.

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    Boost Addict Lifetime Member opiateESP's Avatar
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    The 500T is 1.8 from the cat to the flex pipe. Is that the same for the abarth mid pipe?

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    Senior Member SuperTony's Avatar
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    The Abarth turbo outlet into the cat is 2.5 inches and the cat outlet is 2.25 inches to the mid pipe.

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    Senior Member SuperTony's Avatar
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    Shagghie - your findings are indeed surprising. My stock 2012 exhaust is hanging on my garage wall - I will take a closer look tonight.

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