No idea(wasn't driven), but the compression was lowered to compensate for boost, so possibly less. The point of changing the head and using forged internals is to strengthen it, not to gain more power, that's the turbo's job. I'll put money on the fact that if you don't do something about lowering compression and trying to hit 300(hp or KW?), especially with the FE head, you will spit head gaskets or bend rods like no tomorrow. Just do a huge amount of research on the subject, look for 5S-GTE, 5S-FTE and 5S-GE builds. I will say, most the guys who have done 5S-FTE builds no longer have their cars for various reasons. Come out to a Thursday meet if you can and I'll have a chat to you there about it.