What APR's 2.0 FSI head porting for a MK6 Golf R looks like - Video and pictures
The Golf R uses an older 2.0 turbo design that is referred to as the FSI. For these motors, APR believes there is a lot of power to be picked up in the heads when going for big boost such as their Stage 3 and Stage 4+ packages. APR purchased a Centroid 5 axis head porting machine (see it in action in the video below) which allows APR engineers to create identically ported heads every time they are loaded onto the machine.
APR uses CFD software to design the ports and tests them on the computer in simulation before ultimately using their flow bench and engine dyno. In addition to porting the heads APR also removes what they feel is a huge restriction in the manifold port flaps. This is an area that Volkswagen themselves addressed in the newer 2.0 TSI motors.
APR has not released flow or dyno numbers for their headwork but we have no reason to doubt them when they say there is a lot to gain in this area.