oem mid pipe mod ?
 

Stock x5m/x6m mid pipes
http://www.realoem.com/bmw/diagrams/f/v/253.png

compared to m5/m6 mid pipes
http://www.realoem.com/bmw/diagrams/x/p/386.png

I've recently added down pipes and the exhaust note is a bit louder but im looking for a bit more w/out changing out the stock muffler.

I've heard a stock m5/m6 exhaust and its pretty aggressive but not too much. Upon reviewing both the x5m and m5 exhaust i realized the x5m has an additional muffler and possibly cat on the mid pipes. To compare on a E90/92 m3 the car also comes w/ 4 cats, 2 primary and 2 which are normally replaced with X pipes for 2ndary cat removal which increases exhaust note but also performance.

Akrapovic's midpipe design
http://t3.gstatic.com/images?q=tbn:A...u9TB9kS7CbjjfQ

Supersprint midpipe design
http://www.racingtuning.fr/images/Im.../x6/981712.jpg

I may start replacing one at a time to see what a good compromise is. Anyone else mod their mid pipes ? any decent exhaust shop should be able to do it for a reasonable price

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