im thinking about buying these headers but im want to know about it before i buy it. I wanted to know what kind of sound it makes, if its a nice sound or an annoying sound or any sound at all. If anyone has any sound clips or anything like that it would be greatly appreciated. thank you.

People have reported a "Nascar"-esque sound and 1/4 mile times of 12.9. However, they mess with the o2 sensors on the catalytic converter, which makes the CEL appear. Currently, GSM is working on a fix.