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      03-01-2011, 10:03 AM   #5
Kyoshi71's Avatar

Drives: 2010 M3 Coupe
Join Date: Jul 2006
Location: New York

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Originally Posted by BMRLVR View Post
Don't ever set foot into that so called reputable shop ever again.

Reducing backpressure won't decrease power, period. Sometimes it can affect low end torque by shifting the torque peak to the right a bit but it won't reduce peak power.

To answer your question on how much power to expect, the answer is very little, expect 1-3 HP max from an axle back exhaust. Power gains from exhausts on the M3 (and most cars for that matter) are made by removing the cats or adding highflow cats. Axle back exhausts are for sound and not performance.

If you want a nice sound put on a muffler. If you want a performance gain add an x-pipe with high flow cats or even better, no cats at all.
Damn Strait +1

That guy's just another [sic] tuner who learned the business from magazine articles.
"But resist we much; we must; and we will much; about that be committed."
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2010 E92 M3|Silverstone II|M-DCT|NCSW|2MT|ZCW|ZPP|ZTP|302|507|Gas Guzzler Tax