I have a stock gsr exhaust manifold and a type R mid pipe and a brand X muffler. I'm trying to figure out what cat will fit. The stock gsr cat is only 17 inches long and the gap is 22 inches. I have an old cat from god knows where that fits perfect but its wrecked up to bad to use. Does anybody know what cat "civic/integra/etc" is 22 inches in length?