Billet 75mm LS1 throttle body adapter to a 70.5mm Ecotec LSJ supercharger intake allows the use of a cable driven GM 75mm LS1 style throttle body on a GM 70.5mm Ecotec LSJ supercharger (M62 Eaton) intake. Port bore is tapered, 75mm on the throttle body side and 70.5mm on the supercharger intake side, this allows for smooth flow and full expansion of the air as it passed through the throttle body. Incorporates an IAC relief, revised geometry, and advanced 3D profiling with Opti-Flow technology. Adapter is 5/8" thick, milled on every side and uses a high quality o-ring to ensure a perfect leak free seal. CNC machined 6061-T6 aircraft grade billet aluminum construction. Machined finish. Includes high quality o-ring and mounting hardware. Proudly made in the USA. This billet 75mm LS1 throttle body adapter to a 70.5mm Ecotec LSJ supercharger intake allows the use of a cable driven GM 75mm LS1 style throttle body on a GM 70.5mm Ecotec LSJ supercharger (M62 Eaton) intake. The port bore is tapered, 75mm on the throttle body side and 70.5mm on the supercharger intake side, this allows for smooth flow and full expansion of the air as it passed through the throttle body. Incorporates an IAC relief, revised geometry, and advanced 3D profiling with Opti-Flow technology. This adapter is 5/8" thick, milled on every side and uses a high quality o-ring to ensure a perfect leak free seal. CNC machined 6061-T6 aircraft grade billet aluminum construction. Machined finish. Includes high quality o-ring and mounting hardware. Proudly made in the USA.