GTM Performance Engineering VQ45VHR-Our Journey to The 1000 HP and Beyond

J. Dub

Looks nice, I've heard of their work and it's been nothing but praised.

Here is a quote from their site:

"goal was to increase overall flow and improve flow balance between the runners which will end up giving more balanced power per cylinder and more power overall. After cutting the plenums off and doing some initial testing we had a few flow tests performed that led us to our final design. With full runner and plenum porting, we ended up with ~72 more CFM, better spool, and an increase of 35whp on pump gas. Not too shabby.

As will all our premium manifolds this comes with our advanced ceramics package standard. This coating package consists of two coatings; one on the exterior that is a thermal barrier to help shed heat from the manifold, and a second coating on the flanges of the lower manifold to help minimize heat transfer from the heads to the manifold as well as from the lower manifold to the upper. Good stuff for lowering IAT's.

This service does require you to send in your manifold for the work."

The kicker is that it's not very cheap.