RB25DET front facing plenum to OEM throttle body adaptor (to replace 90/100mm t/b)

This made adaptor allows you to bolt the factory series 2 RB throttle body to aftermarket front facing plenums that commonly run a 90mm or 100mm throttle body. The factory throttle body will support 700 hp with ease. No more air leaks from using a poor quality aftermarket throttle body. Includes countersunk cap screws for mounting adaptor to your plenum.

-Bolt centres on plenum side = 87mm x 91mm

-Bolt centres on throttle side = 78mm x 63mm