89 SHOs are the fastest because they are the lightest. 89-95 All had the Yamaha V6 220hp 200ft-lbs. 89-92 were all 3.0liter MTXs. 93-95 Automatics became more available with 3.2liter 220hp and 215ft-lbs. The ATX's are slower than the MTX 5 speeds. 96-99 (Gen III oval) came with a 3.4 V8 and only an ATX. The V8 SHO are much heavier than the V6 SHOs.