So this is my second amazing product from zzp and these guys and gals don’t disappoint. I have a custom tube intake w/ a spectre filter (will change to k&n as soon as it gets dirty), midlength headers and now the 2.5 exhaust with resonator. I have a 2.2 09 manual cobalt. Ok specs over, the worst part about this was taking the old rusted overweight peice of garbage that is the old exhaust off. Make sure you have a grinder or handsaw. Took me about 15 minutes, some wd-40 and elbow grease to pop it off, and slap these wide pipes on. Make sure to loosen and re-fit it after a ride, because mine sagged a lil and it just needed a lil tightening up and were good. THE SOUND THOUGH! omg when I started this puppy up I couldn’t help but get giddy like a school girl. The headers and resonator match the muffler perfectly. You definitely hear idle, but under 1000 is a low rumble that is tolerable. Very little to no highway drone. Great job on this ZZP. When I hit WOT, it get this **** screaming sound that only can come from an American 4 ****** and I love it. It does have weird idle issues right now, so make sure to budget a tune ASAP, as I lost a lil low end tourque too. All in all, well worth it, and keep up the great work zzp.