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the dent thing is correct theres a clearence issue on the axel nut with some pre 09 slipons many have simply applied a hammer to make room for the axle nut and claim succes with the dent not visiable on the frame side .
I suspect that the HD slip on's for 09's have a cat in them to get EPA approval. Other slip ons will fit, they just are not EPA approved.
There aren't any cats in the '09 CVO tailpipes - they moved them to the headers ahead of the crossover pipe. I'd be willing to bet the length and mounting brackets are probably different than previous years. The frame changed and the headers are a new design (shorter ?) for '09 touring bikes.
I have an 09 SG with SE slip ons from a 08 RG and the guy got them from an 07 RG so I think the lenght and mounting is the same for several years. I had no issue installing them, 10 minutes. They are black and will be for sale in a couple days when my thunder header arrives. $150 plus shipping.