You are nearing the limit of the 5 speed at 350bhp. If you are running 350 you must have something like a vf35 or vf43 turbo and pink injectors.
Sti has 550cc/565cc pink or blue injectors which are larger than wrx ones.
Sti will have alloy lower front suspension arms, not sure if hawk wrx has these, suspension will be different, exhaust parts might be different, interior, gearbox, clutch and starter motor all different, engine internals are different.
Cheaper to just but Sti.
The six speed box is a lot heavier than five speed, but is also a lot stronger.
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