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Old 11-26-2009, 05:56 AM   #28
scrming
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Drives: 12 Second Brick
Join Date: Jun 2009
Location: at my pulpit
Posts: 7,745
Quote:
Originally Posted by kga10734 View Post
Until a company comes up with some drastic hp and torque improvements with a cat back, there is no need for one. As stated somewhere around here, the gains would be a lot more if we were going from a single exhaust to a dual exhaust. Since it already has a dual system, the gains won't be as impressive.

I can only speak for myself but I think the general consensus is, we are changing the stock exhaust out to improve the sound coming out the ass end of this car.
Actually... I'm not sure about the gains of a single vs dual... the 2005-2009 (not sure about the 2010) 4.0L V6 Mustang is 2.25 down pipes to a Y pipe and then 2.5 back to single muffler... Biggest gain was just replacing the muffler. That was good for about 10RWHP (peak!). Number of guys then switched to a dual setup and only seen like 2 or 3 RWHP gain, if that... So there really was not big gain by converting to duals... and that's with a larger 4.0L motor...
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