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i just had some testpipes uninstalled cuz they were horrible and need to get some high flow cats .. i have crawford headers, plenum, nismo intake/exhaust .. and wanted to get crawford cats as well but they might be out of stock and i am headin back to school on the 18th anybody know some other good ones and where i can order them from to have them overnighted to me??
Ive never heard rasp on the nismo exhaust. The pipe diameter just isn't enough. But sure..i suggest random tech or crawford. RT will flow better, but crawford will be cheaper and have good customer support. Both will likely rasp.
As an alternative, you can gut out the secondarys on your stock cats and it'll be like a HFC but w/ 1/2 inch less diameter.