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      06-09-2011, 08:31 PM   #13
kitw
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Drives: F91 M8, 991.2 GT3
Join Date: Jun 2007
Location: Bay Area, CA

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Quote:
Originally Posted by Sean05 View Post
axle back = doesnt matter what kind. 3-5hp please dont believe what people saying they got 10-15hp on just axle back.

xpipe = minus the secondary cat and or resonator... 5-8hp

removal of primary cat = 10-15hp

NOW THIS ALL DEPENDS ON YOUR SET UP. THE MOST I HAVE SEEN ON FULL EXHAUST SET UP IS 28HP....

I'd say it more like this:

Axle back = 0
x pipe = 0
primary cat = something, depending on what you did downstream
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