I'd be happy with about 300bhp for now when I got my car it was boosting at 20psi becouse of a bust hose, now I have fix that it boost at 10 psi and just feels a little flat, it don't have any kick anymore, couple of people who have nosey ed at my car have said , not bad but it's only got a baby turbo on you need to stick a bigger 1 on like a sti, so it got me wondering if it would be a straight swap or would I need to fit a sti exhaust or wrx, would my induction pipe need changing, stuff like that, would the extra bhp I got be worth the extra cost?