I did a Thunder Mfg ( when they were still in business ) air cleaner, cat removal and drilled out plugs in the stock exhaust, and a Dobeck with Stage 1 settings. My plugs look perfect, does not backfire or burp at all, sweet running and not putting it on a dyno ever. Its perfect for me. No clacking, no problems whatsoever. This is a 2014 Chief Classic when everything was standard like lights, oil cooler, and gas gauge. Before Polaris's 'austerity program' that went into effect in 2016. Paint a little soft...........but not problems, and still original battery, never seen rain or been outside overnight like most of the bikes here. Just a good bike. I could say that about the 47 HD too for that matter but guess I lucked out.
Not going overboard in modifications. Just a little more oomph than stock and thats fine here. Everyone is different. I am seeing wrecked/insurance claim Indians now at auctions and would maybe really making one a Stage 3 screamer but I am kinda 'motorcycled' out for the time being. Just draw a line somewhere in mods. Steve