At the very least make the sure car has the sports package/M sport package. The sport seats and steering wheel are worth it alone. Test drive to see what I mean.
Quaife LSD, JRZ RS Pro, JRZ camber plates, Eibach ERS, full M3 susp, custom toe arms, Powergrid end-links, SS brake lines, brake ducting, Michelin PSS, UUC SSK, ETS FMIC, ER CP, Perf. Exhaust, VAC RSIK + Sparcos; work by VAC Motorsports in Philadelphia