i remember reading that exceed would replace your engine, yadak the forum support guy made a post here that said they would replace the engine at no charge, you cant beat that. I would ask him and see but if you want a good, powerful, easy to tune and keep tuned engine, get this bad boy: http://www.clermontmotorsports.com/s...Svg-.21/Detail this is a nice engine too: http://www.clermontmotorsports.com/s...TRUCK-6/Detail my buddy has this in one of his cars and its a nice engine too: http://www.clermontmotorsports.com/s...sh-Port/Detail you can spend alot more too but out of those the 2nd one is the most powerful