Boost it. You won't need to spend any other money really cause you will hit the max the internals can handle. I already blew thousands just to barely hit 300 hp. If I woulda just taken all that money and just bought a blower I would be much happier with the car and likely spent less. As far as boost goes there are guys who are well over 400 hp. It's the tune that matters and not going lean. If it goes lean BOOM. It's over. So your tuner is pretty important in this equation. I got too much money into my car to even sell it. I would never get it back. So I am gonna drive my turd of a car til the motor blows then an m112 topped 4v will go in and I will fall in live with my car all over again. If you have the money boost it. No other mod even compares. I put nitrous on and every bolt on imaginable and I am still not happy.