Does anybody know if you can put on those after market high flow high performance catalytic converters on the 850's? I wont to do that for my car, and one other thing. Does anybody know where I can get tuned headers for my "92" with a 6 speed? I was at http://www.dinanbmw.com/ and they only seem to offer things like that for anything above a "92", and from what I'm hearing they don't even wont to work with 850's anymore, so if anybody know's anything I'd be most appreciative. Thanks all.