Im looking to put a new exhaust on my 08 mustang, I am looking to do new headers, 2 cats and 2 mufflers, what can the expected hp gain be of doing the exhaust this way and what size pipes should I be looking at so the engine gets sufficiant back pressure. I have the 4.0l V6, like I said complete new exhaust system from the headers back, probably going to use the original cat and add on an oem replacment due to cost issues.
To Bungholio, so would it just be better to do headers, an h pipe with a single cat and dual pipes from there?
Don't waste your money on headers or cats. Unless your pushing high hp these flow really well. I would say just get a good set of mufflers (whatever sound you like) and take it to an exhaust shop and tell them you want dual exhaust. Its the cheapest way and you'll get a bit of extra hp and sound better. After all said and done should be about $400-$600 depending on mufflers.
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