well it says up to, so its not guaranteing 50 extra hp. so i am not sure about it. if anything im just doing it more for freeing up the restrictions on the car. i'm only going to put a exhaust after i am sure i need the larger diameter for better flow.
I would turbo but i dont have that kind of money and it already has 82k on the motor so i wanna keep it NA for a while. maybe a turbo later on. i just got 5% tint under $75 while i decide on what to do. looks real nice.