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Muffler delete on my friends 2007 E92 328xi sounds brilliant, we did it a few months ago at a muffler shop for $70 including the y-pipe they had to make to keep the dual tips. Sounds glorious, and burbles/pops when you let off the gas at most RPM. With the possible exception of higher RPMs, which sound a *little* whispy but nothing too bad in my opinion, I would recommend it. And a whole lot cheaper than the PE exhaust.
It is NOT too loud either, very sedate and a little deeper at idle and cruising, and decently loud at WOT but nothing like my E550 lol. Also, I disagree on the low end torque being lost with the muffler delete. It's far enough back in the exhaust system I would venture to say it contributes very little to scavenging which is the primary consideration for generating low end torque (backpressure is a myth the way most people think about it).
Just my .2
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