BMW M3 Forum (E90 E92) - View Single Post - Test Pipes vs Mid pipe vs Rear Section HP gains

MTrezzz · 08-19-2013, 06:55 AM

Active Autowerks High Flow Cats X-pipe?
Or
ACM Test pipes/OEM x-pipe?
Or
Gintani High Flow X-pipe?

Power & weight??? which one would you use? is test pipes louder then high flow?

08-19-2013, 06:55 AM	#24
MTrezzz Major 209 Rep 1,404 Posts Drives: Lime Rock Edition Join Date: Jan 2013 Location: Long Island iTrader: (1)	Active Autowerks High Flow Cats X-pipe? Or ACM Test pipes/OEM x-pipe? Or Gintani High Flow X-pipe? Power & weight??? which one would you use? is test pipes louder then high flow?
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