Thread: Bought Borla 2.25 In/Out Mufflers...Will they be restrictive?

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  1. #1 Bought Borla 2.25 In/Out Mufflers...Will they be restrictive? 
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    Bought some 40357 Pro XS Mufflers 2.25 in/out for my '99 GTP...

    I feel like these will limit my upgrade-ability in the future/be to restrictive with all the mods I will be doing to the car...

    Ported/Polished Heads
    Port matched/Polished LIM
    Ported/Polished blower
    Headers
    Cat Delete

    Should I put the mufflers on and get a custom Cat-Back...will this limit me to 2.25 piping?

    Just get a pre-assembled cat-back system?

    Thanks yall!
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  2. #2 Re: Bought Borla 2.25 In/Out Mufflers...Will they be restrictive? 
    Turbo is the way to go. BillBoost37's Avatar
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    2 x 2.25 = 4.5" of flow at the mufflers. You wont be restricted there. Now what you do from the Y forward..that's up to you.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  3. #3 Re: Bought Borla 2.25 In/Out Mufflers...Will they be restrictive? 
    Turbo is the way to go. Fivefingerdeathpunch's Avatar
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    Stock cat back will flow up to around 350 whp atlest.

    2.25 piping is plenty big for our v6 with mild mods.

    SMGPFC Member #1
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  4. #4 Re: Bought Borla 2.25 In/Out Mufflers...Will they be restrictive? 
    GT Level Member addzradd's Avatar
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    Quote Originally Posted by BillBoost37 View Post
    2 x 2.25 = 4.5" of flow at the mufflers. You wont be restricted there. Now what you do from the Y forward..that's up to you.
    not exactly

    (pi*r^2)*2 gets you 7.94 sq inches of space (pi*1.125^2)*2

    while 1 3" pipe(like your downpipe) has 7.06 sq inches

    so it flows enough to outflow your downpipe but not as much as your simple math shows.

    The biggest cat-back restriction is that the y pipe is more of a T pipe.
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  5. #5 Re: Bought Borla 2.25 In/Out Mufflers...Will they be restrictive? 
    Turbo is the way to go. BillBoost37's Avatar
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    Again ...another guy doing the calculation.

    Sorry..I was using a relative thing instead of an exact nerderiffic science.
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  6. #6 Re: Bought Borla 2.25 In/Out Mufflers...Will they be restrictive? 
    GTX Level Member Sudden's Avatar
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    Gotta love nerds and English teachers when they get on the net.
    2005 Grand Prix GTP CompG. Overkill PCM, ZZP S2 I/C, ZZP MPS W/ 3.3" pulley, 1.9 YT rockers, 42.5# injectors, Moroso wires and AL104 plugs, 180 Thermostat, LS4 MAF.
    Front PLOG, Rear PLOG, crossover, all ceramic coated. ZZP 3" Downpipe and 3" exhaust pipes with Borla S-Type mufflers.
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  7. #7 Re: Bought Borla 2.25 In/Out Mufflers...Will they be restrictive? 
    GXP Level Member ctracer's Avatar
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    07 Black GXP.
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