baisicly if you buy a z for under 10gs then its not worth it..they still go for 20k everyday. wiring harness go, plugs/clips get brittle. that gets replaced while the engine is out. wiring harness is sub400 bucks not bad really. other than that ive messed with em so much that problems are not really problems to me anymore. there are things u can do to make your working on it experince easier.