I just purchased a 13 WRX hatch. I am new to the subie world and modding so I have done a lot of reading. My car is still stock but i would like to eventually do some mods. The more i read about what i should do the muddier it gets. So far i am thinking that the way to go is a turbo back exhaust with a pro tune. How much of a difference should i expect in HP and torque? Is it worthwhile? Will my brakes and suspension hold up? Will this make the car less reliable? Am i on the right track? What will this do to my mpg? I know that i have too many questions but PLEASE HELP!!!