Alot of these exhaust are coming in through China and Taiwan. Check out alibaba.com and you'll see all the replica exhausts available in both SS and Ti for fractions of what theyre sold retail for the authentic pieces. An amuse replica in Ti is currently for sale in the FS section which is made by the company Yosaikazu. Here's the link to that exhaust:
http://www.m3post.com/forums/showthread.php?t=543347
These same company's are making exhaust for many different cars such as the R35. Contrary to what many of you may expect or think, these ebay exhaust are actually quite popular with the R35 crowd, even though the exhausts do need tweaking. For the price, theyre hard to beat. Some brands are a gamble while some have turned out to be pretty good. Here's a link to the e92 m3 exhaust section on alibaba:
http://www.alibaba.com/trade/search?...oduct_en&fsb=y