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This is really a question about JCL spiral baffles, what diameters do they come in? Will they only fit inside Hooker sidepipes? I have access to some 3-1/2" stainless pipe and I thought I might try to make my own side pipes and put fiberglass covers over them.
JCL does make a baffle insert for the smaller stock finned side pipes. I think it is about 3.5" He also makes a 3.5" for Cobras. http://www.spiralturbobaffles.com/