They are head gasket destroyers when used as Nick has described in the thread. Me being one of them lol. At the time it happened when knew very little about how the smarty actually "tuned" the ecm other than it added timing and fuel. High load at low rpm with a fast spooling turbo is a very bad mix. Why mine went. The engine being cold did not help either.
I think the main issue with head gaskets comes from guys running the canned sw5+ levels then not rolling into the throtle.
If you look at the logs of those levels, without revo, you will see tons of fuel thrown at sub 1500 rpm with 17-18* of timing. that's gonna wreck a head gasket.
I guess I just thought we had this discussion before (the one of smartys being HG destroyers) and pretty much came to the conclusion that if they were really that bad we would have see hundreds of reports saying or at least pointing towards the smarty being the issue?
Honestly not trying to start a debate debate as I plan on getting a quad soon and really only got the smarty so I could fix my speedo but just seemed weird to me that this was coming up again.