Ever since I purchased my 9-3 2 months ago, I haven't been able to find shit for performance. It's a 4 cylinder turbo motor (I believe its called the ecotec, shared with Chevy) I don't want to "mod" it like most people, i just want to add a few things to bump up the power. I"m not gonna race it, i don't want a loud exhaust. Just a little BETTER sounding exhaust, and perhaps some more boost. Anyone know any good & reputable companies that can help modify the car yet keep it the way it was intended to ride?