MSD's billet throttle body assembly features a unique parabolic bore design MSD's LS Throttle Body answers the need for a high quality throttle body with a mechanical throttle mechanism that bolts to most factory and aftermarket intakes. The parabolic bore form design helps deliver excellent drivability characteristics during part throttle that typical billet straight bore throttles just can't deliver. We incorporated factory style bearings and seals on the throttle that can withstand years of use on the street or strip. *TPS and IAC not included and are sold separately as PN 2942 or reuse yours from your OEM throttle body.