I really wonder how close a 318ti could get to a 325i/328i in STX with full prep.
Proper DA coilovers w/ 500F/600R spring rates
Fat front sway bar (Turner or Hotchkis)
LSD
245 RE71R's on 17x8.5/9 rims
Lightweight custom exhaust
Tune
All the weight reduction allowed in the class.
If I had the budget I'd try. I've got the right 318ti for it as it is a '96 slicktop (non-sunroof) without any OBD2 emissions stuff such as secondary air systems. No cruise, or no traction control either as it was a very base M-sport model. __________________ 
2000 M5 -> 1996 318ti -> 1997 328i 
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