I've been looking online for an exhaust system for my 1998 318ti. Understeer.com has a stromung exhaust system for $475 and there is an ANSA exhaust system on Ebay for roughly $300. I'd say $500 is tops I can spend. I'm looking to gain as much performance as I can but I don't want my car to sound ricey either. Any help/recommendations are appreciated. Thanks!!