With the auto-tune feature, it doesn't matter what mods, exhaust etc. Just wire it in, turn on the settings and in a tank of fuel, she should be dialed in. Even when you add more mods, change exhaust, etc... it's always watching your riding habits and adjusting. Several thousand miles on this setup so far, and no issues at all, and the bike still runs flawless. Maintenance will stay the same. The switch can be used to go from stock to a custom map. Any two maps that you save on the unit will be at the touch of your fingers.