GReddy Plenum Intake Manifold RB25DET ECR33A great addition to modified #RB25DET engines, the GReddy #ECR33 Intake Manifold Plenum relocates the throttle body for more ideal intercooler charge air pipe routing. p n 13922316 is designed to use larger Q45 Throttle body or equivalent. *Use weld on p n 13920450 to convert the plenum to use standard throttle * *body relocates throttle position *must use larger Q45 throttle body (or use adapter p n 13920450)