Turbochargers. They must be handled with great care as DB mentioned, especially after landing and before shut down. They must be run down for the correct duration and then 30 sec's. T/C's on a single are even more critical as, if the t/c is lost, you probably wont maintain altitude. Worth remembering that.
If you are not already aware propellers and stones dont mix. Best is no standing start t/o's at full power before brake release for e.g.. Also do the run up (with extreme care) on the run, on the strip if it is stony, on the move controlling speed with the brakes. If you get good at it you wont even need the brakes. You will save yourself propellers believe me. Any Other way and you are doing a t/o without knowing what damage you have on the propeller before that t/o.
Tail wheel of course not such a problem.
Just my 2 cents worth.