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      11-09-2012, 12:48 PM   #22
per
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Drives: M3 E92
Join Date: Jul 2007
Location: Sweden Gothenburg

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The most important thing is that you get catless midpipes, the brand is not that important.
RPI gives the most whp,but sounds like crap with stock mufflers (like a 2 stroke engine)
If you have a more restictive midpipe= more mid range torque, a little less hp on top.
Less restrictive =more power on top,a little less torque midrange.
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