Yea simple, put in a cold air or ram air intake, chip the ecu, pulleys, camshafts, pistons, headers, exhuast sytem, light weight rims, injectors, ACS tuned springs, stut bars, coilovers, struts, shocks, throttle body, ... etc. Heres a good place to search some stuff. http://www.andysautosport.com/bmw/1999_2003_3_series/