haven’t modded much on the xp but i had my renegade done with a hmf slip on, programmer and air filter, most can am guys argued that the programmer isnt needed for a muffler swap. hows it go with the polaris?already have a muffler thats been on the shelf for a few years but never bothered, this was always the peaceful stock trail bike, now its my primary and its been getting more love. after doing a full kit on my buddys bike last weekend i miss the rumble.