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Thread: Norcal ss free downpipe mod

  1. #1
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    Norcal ss free downpipe mod

    I've been getting tons of PMS on this and very easy mod so here we go. Lots of people here want to pass emissions and get better performance and the stock one is more than up to the task. If you look at the oem downpipe its MASSIVE in size EXCEPT at the exit where it goes to about 1 7/8 at the opening which is a big bottleneck

    My mod consists of just filling in the area above the downpipe and then opening up the hole to match. If your running a stock exhaust its a waste of time to do this that being said here are a few options.

    OPTION 1
    You can open up oem downpipe to 2.25 inches and use the magnaflow cat back i have here
    http://www.tbssowners.com/store/inde...&productId=225

    The magnaflow goes from 2.25 inches for about 2 feet to a 2.5 inch set up all the way back


    OPTION 2
    You can open up the oem downpipe to 2.5 inches and run the NEUSPEED cat back section here
    http://www.fiat500usaforum.com/showt...uspeed-Exhaust

    The NEUSPEED is 2.5 flange back just the magnaflow back section i feel flows better which you can see in the pics.


    LETS move onto the oem cat
    The stock one flows good only downside is the exit so here we go

    stock inlet 2 7/8


    pipe after inlet OD 3 1/8 INCHES



    CAT OD 5 1/8



    And here is the killer oe exit ID 1 7/8 INCHES




    After you remove the downpipe just fill in the area above the flange (weld) and then get a grinder and open up the exit to 2.25 inches or 2.5 inches to whichever exhaust set up you want to go with.
    I opened up mine to 2.5 inches (i have a custom 2.5 magnaflow cat back) and you can see how much bigger is verses stock




    Once again id like to say DO NOT do this if you have stock exhaust waste of time and Ive installed the mangaflow on my car and deff mid to top end performance increase and ive installed the neuspeed on others also and same result. I feel due to the way neuspeed does its rear piping the flow of the magnaflow and neuspeed is pretty close. Just depends on if you want to spend the extra cash.

    I do these cars for fun and this is one of those projects I feel guys like me who want good hp on least amount of money spent is well worth it. If you have questions just ask guys im always around to help.


    Note I tried to keep the oem look so took it off the car and did it. If you want to get the 2.5 flange from ATP turbo they have them like 45 shipped and you can cut off oem flange and weld it on also. For me I just wanted the most oem look I could.
    Last edited by NORCAL SS; 12-11-2013 at 06:10 PM.
    CHECK OUT MY NORCAL SS VENDOR SECTION FOR MANY AFTERMARKET FIAT PARTS AT THE LOWEST PRICES PLUS 24/7 CUSTOMER SUPPORT. FEEL FREE TO CALL OR TEXT 24/7 AT 415 519 2432 OR EMAIL TONY@TBSSOWNERS.COM

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    MY 2013 ABARTH BUILD >>>>>>http://www.fiat500usaforum.com/showt...3-Abarth-Build

  2. #2
    Super Tech Lifetime Member shadowshaggy's Avatar
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    Quick question, I'm not real familiar with the stock exhaust I.D. but would assume it's 2" correct? Hypothetically then, if one were to open it up to 2.25" and have the stock exhaust for now and at a later time upgrade to the 2.25" or 2.5"; wouldn't you get some marginal gain at the present time? Then after you upgraded to the 2.25"/2.5" get a proper gain as a result of the exhaust you install, I believe that would turn out that way. By all means, if I'm off base speak up.

    Also, NORCAL SS: You're freaking awesome for your work on these cars. I want to take a minute to express my gratitude to you for all the work/effort/development/deciphering nonsense that Mopar/Fiat engineered into these damn things/time. The dyno shootout thing is among the tireless projects, as well as this mod, that you've helped out the community tremendously. (Can't say more than anyone else, cause that'll start another vendor "who's got the bigger d*ck contest") But we all can't thank you enough for helping us all out. Thank you sir for your troubles, and look forward to the next project you start on for the Fiat's.

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    For us guys that don't know what we're doing... (no I won't do this on my own but to explain it to someone that would help me out with the issue)

    After you remove the downpipe just fill in the area above the flange (weld)
    What do you mean by this? Are you just saying to fill it in so the crap from grinding doesn't end up in the cat or something else. Step by step instructions for dummies would be awesome.
    Rame 2013 500T - Gone to the great auto dealer's trade in lot in the sky.
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    Super Tech Lifetime Member shadowshaggy's Avatar
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    He means to fill in the outer side of the flange. The material isn't real thick after you start up the die grinder, so you're adding material to the exterior/top of the flange since you're basically taking material from the inside/factory welds of said flange.

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    Quote Originally Posted by shadowshaggy View Post
    Quick question, I'm not real familiar with the stock exhaust I.D. but would assume it's 2" correct? Hypothetically then, if one were to open it up to 2.25" and have the stock exhaust for now and at a later time upgrade to the 2.25" or 2.5"; wouldn't you get some marginal gain at the present time? Then after you upgraded to the 2.25"/2.5" get a proper gain as a result of the exhaust you install, I believe that would turn out that way. By all means, if I'm off base speak up.

    Also, NORCAL SS: You're freaking awesome for your work on these cars. I want to take a minute to express my gratitude to you for all the work/effort/development/deciphering nonsense that Mopar/Fiat engineered into these damn things/time. The dyno shootout thing is among the tireless projects, as well as this mod, that you've helped out the community tremendously. (Can't say more than anyone else, cause that'll start another vendor "who's got the bigger d*ck contest") But we all can't thank you enough for helping us all out. Thank you sir for your troubles, and look forward to the next project you start on for the Fiat's.


    the factory downpipe is 1 7/8

    the oem bolt up section is 1 7/8 9some areas crimps down smaller) Here is the magnaflow 2.25 vs stock


    I would not even waste my time opening up the oem downpipe to 2.25 and keep the exhaust stock. I know the non catted downpipes are 2.25 exit and create some power due to no cat but i would do the cat back plus opening it to 2.25 or 2.5 at the same time. If your going to do it just do it one time and be done with it. As you can see by my feed back and others its worth it.

    You guys have got to realize this is a side business for me and its fun. I'm a car guy before anything and have been like this for years. I like my cars to have the best products but at the same time stuff that works. Thru my testing/mistakes and findings i'm hoping to get real answers to many questions myself and others have here which is "what gives the best bang for the buck?" and offer the guys here parts which they can trust will work and at pretty much the best pricing around.

    As on my other forums I run its all about the members because without you guys I wouldn't be doing any of this and we all wouldn't be here.
    Last edited by Tweak; 03-14-2014 at 08:54 PM. Reason: Edited per user request.
    CHECK OUT MY NORCAL SS VENDOR SECTION FOR MANY AFTERMARKET FIAT PARTS AT THE LOWEST PRICES PLUS 24/7 CUSTOMER SUPPORT. FEEL FREE TO CALL OR TEXT 24/7 AT 415 519 2432 OR EMAIL TONY@TBSSOWNERS.COM

    NORCAL SS FIAT STORE PAGE >>>>http://www.tbssowners.com/store/inde...ewCat&catId=28

    MY 2013 ABARTH BUILD >>>>>>http://www.fiat500usaforum.com/showt...3-Abarth-Build

  6. The Following User Says Thank You to NORCAL SS For This Useful Post:

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  7. #6
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    Quote Originally Posted by tknospdr View Post
    For us guys that don't know what we're doing... (no I won't do this on my own but to explain it to someone that would help me out with the issue)



    What do you mean by this? Are you just saying to fill it in so the crap from grinding doesn't end up in the cat or something else. Step by step instructions for dummies would be awesome.


    Take off cat from car
    the area above the oem flange fill in with weld
    Open up oem downpipe to 2.25 or 2.5 inches depending on what you want.
    Slap it back onto the car with a magnaflow or neuspeed exhaust
    Enjoy the extra power

    or
    buy the flange from atp turbo
    cut off end of oem cat
    weld from inside the flage
    Smooth out the welds
    slap on the 2.5 neuspeed exhaust
    Done
    CHECK OUT MY NORCAL SS VENDOR SECTION FOR MANY AFTERMARKET FIAT PARTS AT THE LOWEST PRICES PLUS 24/7 CUSTOMER SUPPORT. FEEL FREE TO CALL OR TEXT 24/7 AT 415 519 2432 OR EMAIL TONY@TBSSOWNERS.COM

    NORCAL SS FIAT STORE PAGE >>>>http://www.tbssowners.com/store/inde...ewCat&catId=28

    MY 2013 ABARTH BUILD >>>>>>http://www.fiat500usaforum.com/showt...3-Abarth-Build

  8. #7
    Super Tech Lifetime Member shadowshaggy's Avatar
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    Quote Originally Posted by NORCAL SS View Post
    I've been getting tons of PMS .

    You sure?

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    Senior Member ReconTopher's Avatar
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    Quote Originally Posted by shadowshaggy View Post
    You sure?
    he he he.
    2013 Abarth Cabrio double grigio

  10. #9
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    From original thread yes so had to put this one up to clear up the questions.
    CHECK OUT MY NORCAL SS VENDOR SECTION FOR MANY AFTERMARKET FIAT PARTS AT THE LOWEST PRICES PLUS 24/7 CUSTOMER SUPPORT. FEEL FREE TO CALL OR TEXT 24/7 AT 415 519 2432 OR EMAIL TONY@TBSSOWNERS.COM

    NORCAL SS FIAT STORE PAGE >>>>http://www.tbssowners.com/store/inde...ewCat&catId=28

    MY 2013 ABARTH BUILD >>>>>>http://www.fiat500usaforum.com/showt...3-Abarth-Build

  11. #10
    Super Tech Lifetime Member shadowshaggy's Avatar
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    Oh come on, does no one else get that joke? Thanks Recon, we got jokes

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