The second E21 model was the monster Hartge H3S 335i. For this Hartge modified a 6-cylinder 3.5 L transplanted out of a BMW 635CSi. This produced 205 hp (153 kW) which was a reduction in power compared to 218 CVs of E23 and E24 made necessary in order to meet anti-pollution laws in force, which set limits to emissions of CO in relation to weight ratio power. Since the 3500 cc engine coupled to the body of the E21 Series 3 was smaller and lighter than the 6 Series and 7, it exceeded these limits and was necessary to cut 13 hp (10 kW) in order to obtain approval. In 1982, thanks to head, valves, camshaft and exhaust manifolds, specific power reached a peak of 240 hp (179 kW) for a maximum speed of 240 km/h (149 mph) and launched it from 0–100 km in 6 seconds.