mk4 is the newer style. im not sure if i want to let it go, just seeing what the market is like. and yes it has posi rear-end(4.1 gear) that is called a torsen. it is all gear type meaning it doesnt have a clutch pack that can wear out, it will last forever(unless you shatter it some how) whith all the work that i have put in to it it would be hard to get rid of it. ONLY if the right deal came along i would do it. the fact that i dont owe anything on it makes me want to keep it. but like i said if someone can understand the work that went into it and is willing to pay for it i might. i really would like a mk4 though.