I had the RPi GTM axle-back on my E93. That thing gives the M3 a very bad-ass racecar sound! The grins on the service mechanics' faces are just priceless, as they're pulling that beast in and out of the garage. Unlike other exhausts, the sound of this one doesn't die down through the revs. Also, the price for it brand new is a pretty sweet deal.
Just a shameless plug, as I've been meaning to put my RPi GTM up for sale. I love this thing, but I needed something a bit quieter for the long commute home from work. Also, I live in a quiet community and this thing will make babies cry.
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