Today at PSI PROformance we had this Subaru WRX STI Hatch in for a dyno tune. It appeared pretty much stock on the outside, but it had plenty of work under the hood to push some power. Some of these modifications include a FP Red turbo, Front Mount intercooler, Full Race Equal Length Manifold, and Wiseco Pistons and Eagle Rods. With these mods the car was able to make 429 whp and 400 tq on about 23 pounds of boost. Here are the photos and video from the dyno tune. Enjoy!