You won't need new pipes, just a reduction pipe where you are joining it to your current setup. Your exhaust shop will know what to do. If your planning on upgrading to an M6 rear and can get the exhaust at a good price, then go for it!!

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2008 BMW 650i Convertible- LCI.
- ACS style rear spoiler
-Eisenmann Race Exhaust, resonators removed, Magnaflow X pipe.
- LED Angel eyes, plate light and interior package
- Tinted Windows- Charcoal 20%
- Stock 19" summer wheels & 18" M6 Winter wheels