As you might already know, APR is squeezing even more power out of the FSI platform. The expected numbers are rediculous!
436 WHP out of a FWD application is over 500 crank HP!
So far, we know that APR Stage 4 will consist of all the components of APR Stage 3 ( http://www.goapr.com/products/about_20ts3.html), low compression pistons (I think somewhere around 8:3:1), stronger rods, and cams.
Here are a few vids of this beast in action. This gives us an indication of whats to come.http://www.youtube.com/watch?v=MtO2dh8BCPA