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imom - North Haven sells the CSL ones for around 1700 new. I however recommend (and this is what I did) searching e46 M3 classifieds as a ton of those guys have done this and some are now starting to part out their cars and have parts for sale for awesome prices.
The other option is to look at aftermarket new ones from places like Fabspeed. Those are around 1100'ish I think and gains are comparable, if not more due to the longer lengths of the pipes, from what I have read on the M3 boards.
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