Thankfully I didn't have to use my warranty much, but the mods I made to my bike in the first year (complete elimination of the airbox before the Freak ever existed, removal of the AI, etc.) didn't impact warranty claims at all. Now maybe if my engine blew up they'd blame the mods. I had the speedo cable loop replaced, the rear brake switch and a bit on one of my carbs. I suppose the last thing they could've denied. Maybe it's more up to the dealer, but they didn't blink and eye. Maybe the Triumph warranty doesn't care if it's under a certain dollar amount.