Thread: Stock Cats
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Old 06-21-2010, 06:52 PM   #6 (permalink)
PR370z
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Location: Puerto Rico
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Drives: 2008 BMW E60 M5
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Quote:
Originally Posted by esfourteen View Post
first, I think you might be confused as to the oem exhaust setup, theres 2 cats total, one on each side, right after the exhaust manifold, before the Y pipe. thats it, no pre/secondary cats.

second, dont ruin your stock cats, pick up a set of CNT resonated test pipes, they cost $200 shipped.
will the CNT resonated test pipes give me more sound, or is it better just to go with staright test pipes? Also I already have K&N drop ins, what kind of HP increase should I expect?
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