im currently building my h/c/i setup. im going with gt40p's with oversized valves and ported exhasut, custom cam(fti), and either a performer or rpm intake. im debating which should i get? performer or rpm?? im leaning towards the performer since the rpm is more of a top end manifold. will i actually gain hp/tq if i went with the rpm??? ohh yeah im also going with 3.90 gears