I had my Z in their shop a couple weeks ago to get my Haltech tuned for flex fuel and I had them check my compression because it appeared I was getting some blow-by. Long story short, some of my cylinders had some nasty compression so now I have to rebuild my bottom end. I didnt have any blow-by before I took it to another shop to do some work on it. Pisses me the hell off how this shit happens. If it were I who blew my piston rings then I would be disappointed; but when It's another shop that does it...that goes way beyond disappointment.