Okay when I had my Zx2 and my Cougar I bought an exhaust from these guys. It fit like a glove and you can choose the type muffler you want. You can choose from Magnaflow, Borla, and Flowmaster and all of there bends are top notch. Another thing you can choose is the diameter of piping you can use. And if you wanna do your own thing there are piping only kits. They made Y pipes for my Cougar so I would assume they would make downpipes for the SS/SC. I was just wondering if you guys were interested in another company making exhausts for us. Check them out at Trubendz.com. I sent them an email, asking if they were interested in starting to make exhaust's for the Cobalts.