hi, i have got a 97 328i sport too.
ebay is the best place to pick up genuine 1st/2nd hand parts.
i got asc blistein shocks n springs £245
remus acs backbox £255
CAI hybrid (dave f kit) a must! pulled 14bhp off a stock M3 on video. £165
then if you go to
www.e36coupe.com and look for a member called alpina537, this guy makes modifed M50 intake manifolds, (as the M52 ones we have got are restricted). and also the BBTB.
both parts are roughly £450 then obviously fitting costs apply, get all those mods done and a live obd II remap from chipped uk about £300>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> and the car will be a fookin animal. pushin perhaps 245bhp an a shitload o torque ar kid. for under £1200.
next im gonna try the supersprint de-cat and the T304 uprated exhaust spaghetti manifolds, then she's going for a dyno....