well, I was told by someone, in the know, that Langley turbo pistons are a straight swap.... it's not, they are too tall, 3mm in total, so I was stuck with them and had to make a plan, had 1mm chopped off the std A15 rods, and 2mm from the tops of the pistons, they where nicely dished to start with, so things actually worked out rather well in the end... I'm pushing the 290,000 Km mark here, and not a single glitch from her... lately though, I'm noticing a slight bit of smoke, when I lift throttles, figuring it to be the turbo's Turbine oil-seal that might be a tad bit on the going-out phase of it's life... these pistons are however more than capable of holding 15PSI all day long... as long as you keep detonation under control. For that I'm using a home made boost-regulating detonation detector.