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I've been following and reading some posts on installing RK slip-ons. Have also read how to mod them for more sound. Everyone talks about drilling out, knocking out plugs, etc. Today I found a local customizing shop for Harley's and asked if he had any RKs. He took me over to a shelf he had in back and got several down to show me. One set were stright tip and I could not see through them another set which he had cut out (gutted) were in bad shape. Then he showed me what he said was a newer set (he said from an 06) that were slash cut style and were in good shape. When I held them up I could see all the way through them no plugs or anything blocking view or anything. I could see a pipe in the center with lots of holes in it running the length of the inner pipe. He said they were stock and nothing had been done to them. My question is are there diff cores in the stock RK mufflers. Some blocked by plugs and baffles and some that you can see stright through? Sure need help.
