Great idea, but for 30 odd grand US I get a set of cylinders and fittings, untried on a L/TIO 540. And according to the website untested as yet even on a o-540. Hmmm, oh. the lack of an STC or PMA MIGHT be a problem here too. Like I said, great idea, but for 30 grand US, I can buy a set of cylinders for each engine between overhauls and stilll have money to spend on running them slightly rich anyway............. Oh for the day of real technology.........BTW the TBO in OZ will still be 1800/2000hrs for a L/TIO 540, as the bottom end will be the limiting factor..........