Not sure on the year, maybe an 04 or 05? It's 2 GT30's and an AMG Supercharger. The goal is to hit 800 horse power. I'll shutup, click the links.

http://forums.vwvortex.com/zerothread?id=2180560&page=1

http://www.forcedairtech.com/turbokits_wrx_stage5.html

That thing is badass but must be a tuning nightmare.

it is a tuning nightmare the guy that owns that car is on nasioc, that sh** is so stupid, just do a crawford built motor and a gt42r if you want 800+whp

fuckk every working on that.. like its cool to say but soo much easier to just build the motor and do a gt42r