1 4 STINGER EGT THERMOCOUPLE 800 TC S4 36 vacuum modulator lines if you have the 8 3 4 vacuum modulator lines if you have the 8 3 4 Inch Rear Axle then you will need YRA6702OM Select the mode that best suits your application Provides crisp shifts on any stock automatic transmission Eliminates shift overlap and excess wear on clutches and bands due to slippage The B&M Shift Improver Kit the easiest way to get the stout performance you've always wanted out of your automatic transmission and you get two modes of performance to select from: Heavy Duty Year Make Model Submodel Engine Size Universal Supercharged and turbocharged engines use EGT sensors rather than air fuel sensors due to the volume of fuel being passed through the engine