I had one on my 02, only damage it caused was to my wallet. Got me started, now look at my truck! Overall, wasn't a bad product, never had any problems with mine. Would be a good upgrade for someone that doesn't need 300 more HP. Just wish I wouldn't have bought mine when it first came out at 500 bucks, they are about 150 or so now. Definitely hurt the resale value of mine when I resold it! Overall, I don't think you will find anyone that had damage caused by one. I give it two thumbs up on reliability, but only one on power. 65 HP will only leave you wanting more, trust me.