I just got a video of the M Sport Exhaust reving. It sounded really good, louder, but not teenager in a honda with a fart can loud. Nice tone, aggressive and controlled. Anyway, I will shut up now so you can see the video.
This car was ALL M'ed up, btw, wheels, interior, exhaust, e-brake, M brakes, etc. I will be able to get some pics next week and I will try to post them up online. I was short on time when I got this video.
Official BMW Description:
Developed using state-of-the-art CAD and FEM technology, this stainless steel exhaust system enhances the sound quality and volume of the hallmark BMW inline six-cylinder engine. A unique, high-tech look is provided by two chrome-plated 80 mm exhaust tips which are laser-engraved with the M logo. Exhaust backpressure is reduced and a sporty powerful tone is heard (without the droning noise typically associated with some aftermarket exhaust systems) with the BMW M Performance Exhaust System.
MSRP: $1,250.00
Full BMW M Performance Catalog
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Video Describing Development of M Performance Parts