Wrxs are limited by the gearbox to the 350bhp mark
 
	To boost power you would need a better turbo and injectors along with a remap plus afew bits
 
	If you looking for over 300bhp you better off selling and buying an sti as itll be cheaper that the cost of yours plus modding also the sti has a 6 speed box and brembo brakes to name afew inprovements