code in the United States, ZHP (the order code in Canada was ZAM). It was available for 330i sedans from model years 2003 to 2005, and available for 330ci coupés and convertibles from 2004 to 2006. It included various aesthetic changes over the regular 3 series, as well as functional and mechanical enhancements. The ZHP was equipped with sportier camshafts and revised engine tuning to increase power output from as well as a shorter final drive gear ratio, and a corresponding increase in redline from 6,500 rpm to 6,800 rpm. Suspension was modified over the standard suspension with firmer springs and dampers, larger anti-roll bars, stronger front control arm ball joints, a lower ride height, heavy duty steering rack, and slightly more negative camber. Car and Driver magazine track-tested the car, which recorded a 0– acceleration time of 5.6 seconds and a 1/4 mile time of 14.3 seconds. 325i SULEV In some parts of the United States, BMW sold a version of the 325i which met the super ultra low emission vehicle (SULEV) emissions standards. California, New York, and Massachusetts received the SULEV E46's in 2003, and Vermont in 2004. They utilised a variant of the M54 engine named the BMW M56. The M56 meets SULEV standards, as well as partial zero emission vehicle (PZEV) and zero evaporative emissions requirements. The M56 is claimed to have identical power output as its M54 counterpart. Model year changes 2000 Electronic Stability Control ("Dynamic Stability Control") introduced, replacing the previous ASC+T traction control system. Manual shift mode ("Steptronic") added to automatic transmissions 2001 facelift (LCI) In September 2001, the facelift (LCI) versions of the sedan and Touring were released for the 2002 model year. 325i (M54 engine) replaces 323i (M52TU engine). 330i (M54 engine) replaces 328i (M52TU engine). 320d engine upgraded from M47 to M47TU. Display for navigation system upgraded to widescreen. Sedan and Touring receive revised headlights, tail-lights, grille, hood, front fenders and front bumpers. Single Xenon headlights for 2001 and in 2002 Xenon were installed for high-beam lamps; Bi-Xenon headlights for 2002. 2003 In March 2003, the facelift (LCI) versions of the coupe and convertible models (except M3) were released for the 2004 model year. Navigation system upgraded to Mark IV version, which is DVD-based. Auxiliary input for sound system becomes available. SULEV engine option (M56) becomes available for 325 models with automatic transmission. Manual transmission for 330 models upgraded from