garrett does the work at the dealership. and as far as that "warranty" on a clutch at the dealer, its going to be real specific as to what the problem is, they are not difficult to install, it dosent take a genious to get a job at a car shop. it just takes you actually trying it or helping 1 time then you get the hang of it. kassanova lifted my engine and did my clutch in my driveway. works perfect. there is always going to be a possibility something happens. if someone is doing it cheap id look at it as they are helping you out and its not easy, so throwing them some cash is worth the help, not that they are entirely responsibe if something happens. you need to help them and pay attention and double check things as you go along.