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Sorry if this has been asked before...did a search but couldn't find the answer.
I've got a 2010 Heritage with Rush slip-ons, SE A/C, and HD map. I want to put the stock mufflers back on. If I do this, will I need to get another tune/re-map or will it not have any real affect?
You will run a tad richer probably, and since you got the HD map that wouldn't be too bad. As the Stage 1 HD map is EPA compliant and still a bit lean.