Shame you didnt ask a few days ago, a guy on the liberty forums had a full raptor kit for sale. He still has a few exhaust parts left. A place over east called pulse racing have done a twin turbo kit. Not sure if its mass produced though. You could also get a custom single turbo built like the might car mods build.

Finally, since it sounds like you relatively close to stock, you could sell it and buy an Sti :P