There are shorties on the market that will bolt directly to the factory y-pipe. $300 to $600 for a good set that won't fall apart in 2 years or less. I'd go long tube with a cat delete and all new tail pipe section for the best bang for the buck.
I have a set on my 07.5 and love em with a true single 3" tail pipe section and a Thrush welded series muffler. You'll want the multi layer steel gaskets, high heat spark plug boot protectors and new header bolts also.
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