GTM Performance Engineering: GTR Manifold Conversion

Mike@GTM

We are happy to announce our GTM GTR intake manifold conversion. Our custom cast lower intake manifold has a smooth transition from the VHR cylinder head ports to the GTR’s upper intake plenum. This allows the factory GTR upper plenum to be installed on the VHR engine.

For those wondering why we embarked on this, we noticed that the factory plastic manifold on the VHR would start to swell under higher boost pressures. The GTR’s cast aluminum plenum will not. Also, the GTR has a larger twin plenum design as opposed to the slimmer single plenum design on the factory VHR manifold. Generally, larger plenums will develop more torque than smaller plenums.

Also, due to the small inside diameter of the OEM fuel rails, we are offering a higher volume fuel rail system that comes in -6 or -8. The fuel rail system can be used with the factory style returnless setup or as a full return fuel system for higher power cars. This conversion kit can be used for forced induction or NA.

We are offering introductory pricing on our website here: GTM Motorsports*::*INTAKE*::*GTM GTR MANIFOLDS CONVERSION MOD KIT

Our adapter can be purchased separately or as a complete kit with the OEM GTR upper plenum and our fuel rails. Here are the links to the separate items:

GTM Conversion Manifold:
GTM Motorsports*::*INTAKE*::*GTM LOWER GTR INTAKE MANFOLD CONVERTIOD

OEM GTR Plenum:
GTM Motorsports*::*INTAKE*::*GTR UPPER INTAKE MANIFOLD

OEM GTR Manifold Cover:
GTM Motorsports*::*INTAKE*::*GTR UPPER INTAKE MANIFOLD COVER

GTM High Volume Fuel Rail (-6):
GTM Motorsports*::*FUEL SYSTEM*::*GTM High Volume Fuel Rail - VQ37VHR

GTM High Volume Fuel Rail (-8):
GTM Motorsports*::*FUEL SYSTEM*::*GTM HI VOLUME FUEL RAILS KIT -8


We have brought in a virgin test vehicle specifically to test the manifold on multiple levels: all the way from stock, untuned to tuned, tuned with intakes, OEM exhaust, aftermarket exhaust, turbo and supercharger kit. We will also be developing a strut tower brace that will work with the GTR manifold.

In the meantime, here are some pictures of the conversion: