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      11-02-2009, 09:36 PM   #21
slipstream
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Drives: 2009 LeMans Blue E90 M3 [sold]
Join Date: Jun 2009
Location: Sonoma County

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Quote:
Originally Posted by Singletrack View Post
The dyno operator was shifting way too early which is what made it sound so bad. The actual pull sounded like a race engine.

I think it's the stock muffler - it's tuned for the OEM midsection. My car sounds a little "off" with the fabspeed resonated xpipe and the stock muffler at low speeds and high load. The thing sounds absolutely amazing at 4k plus though.

I would guess you get similar, but not identical, sound with all the aftermarket xpipes.

Thanks for posting this for the forum!
I think you're right about X-pipes sounding similar, although I'm guessing the pipes without resonators all add a few more dBs. Mine also has a nice snarl starting around 4,000 rpm. Unless I'm shifting or on the gas, I hardly notice a difference from stock at lower rpm.
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