Quote:
Originally posted by Hammer
Exhaust:
Cat-back\Muffler systems change sound only....
X or H-pipes will give an increase in HP (anywhere from 5-15 HP at the crank depending on the engine setup)
I would only recommend after-market headers if you plan on major N/A mods or a blower....
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HOW can you say sound only???? They provide much better flow then crappy stock mufflers, i mean depends on the brand of course, flowmaster is proberly most common on stangs