8th # in vin is a 5 for SH, 4 for baseEngine serial # is H22A4-X000001 for base, H22A4-X500001 for SHSH transmission is M2U4 (only manual)Base transmission is M2Y4 (manual) M6HA (automatic)Things SH has that are different:ATTS (active torque transfer system), atts light in dashATTS has a cooler line from radiatoroverall steering ratio SH: 15.61, base: 15.75various additional sensorsSteering wheel has a 3rd notch (not visibal unless removed)No 3rd brake light in the rear deckSpoiler w/3rd brake light5 Spoke rimsRound ring on shift bootRound style shift knobCourtesy lights on door panelDifferent shocks/springsOil filter is higher up on engine blockBody colored side and rear lipsType SH decal on the rear trunkATTS light in your cluster (only on when atts is not working or you 1st start the car)This is all from Preludepower.com, I'm sure that is where the person above got their information from as well.Here's a direct link...http://www.preludepower.com/forums/s...id=&highlight=