IMHO Karbonkid, keep the middle pipe as I think that's where the rasp comes from.
Change the BB, its by far the cheaper than the cats and a good place to start.
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My Car
2004 M3 CSL with Supersprint Lightweight Race and AP's front and rear 
Quote:
Originally Posted by Niel333
...One thing I know is the CSL is nothing like a normal M3 and I am loving it!!
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