Quote Originally Posted by speedminded
The J30 was a 4 door with a similiar engine to the VD30DE found in the N/A Z32 (intake, tuning, etc.), the M30 was a 2 door with the Z31 engine....technically the J30 replaced the M30 since one ended and other began around the same time.
Actually both the J30 and Z32 300z (N/A) had the same VG30DE(227 hp/198 ft.lb jap spec). The M30 and Z31 300z (N/A) had the VG30E (153-160hp/180ft lbs)