The only thing I would recommend is stay away from the fiberglass ones and stick with abs or some other form of tough plastic. I had a fiberglass one years ago and it was so thick that it had to be modified so that the hinges & latches would work. Plus, the inside was very rough and the entire pak was heavy as it sat empty, putting alot of stress on the mounting rack. I eventually ended up with a brand new unpainted HD brand pak (09-13) and use that. The reason I went with an 09-13 model on my '15 is because I already had the detachable mounting rack, backrest, luggage rack, and premium hinges and latches, so in the long run, it saved me a few hundred dollars.
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2015 Denim Black RG, FM ss ceramic coated 2-1-2 pipe, White Bros Original E Series Mufflers, FM ac, PV Tuner