97_subaru_legacy_GT

I have a 1997 subaru legacy with the 2.5 Here in Lousisiana it is extremely hard to get parts for my car since subaru didn't become popular down here until they turned out the WRX. My car is canadian built with a jap motor in it. There was a company in Canada that I was dealing with for performance parts but they closed down. First of all does anyone know of good shops/websites for this vehicle? I am looking to make a stang killer out of my legacy. I figure 300-500 hp. I have already installed a lightened flywheel, stage 1 clutch, a cold air intake of a impreza that I modified and an aftermarket exhaust. I have street cams that I bought for it and I am having the heads C&C machined next week. The guy porting the heads for me told me there would be no point in boring the block because the pistons are already large for a four banger. It will also be balanced and blue printed. I figured i could buy aftermarket domed pistons for more compression and have someone mount a turbo for me. Suggestions would be greatly appreciated.