intake: used K&N FIPK if you can find one, check out
www.supraforums.com forsale section. or you could get the universal kit from
www.suprasport.com. or... another option is buy an adapter like this
http://www.supra-sport.com/images/Adapters.jpg for US$15, and get a K&N from Lordco or the like, email
toysport@supra-sport.com if you want one of those.
exhaust, go to the same guy nashman went to, $300 for piping i think, plus the cost of the muffler (you can get a magnaflow 3" stainless for around $200). as for downpipe, if your interested, i can get a one-peice (no turbo elbow) for US$300... over $100 less than retail, polished stainless steel....
im asumming you have an 88? what color/options/condition etc?