I dont know where this post would really go, but Im wondering if anyone makes 4" extension pipes for aftermarket headers. The problem is that I have DC 4-1 headers on my LS motor but they're not long enough to reach the cat converter. So I need about a 4 or 4.5" pipe extension with the o2 sensor bung in it to complete my exhaust system. I need flanges on both ends that are free floating so I can turn them to line up with the ends of the headers and cat. Any help would be dope. Thanks