Hi, This has probably been covered before, but I'm too tired to trawl through pages! basically when I save up enough pocket money I'm going to be ordering me some new shiny bigger pistons, and I need to know what compression ratio to choosefor turbo application. they will be 83mm pistons, standard stroke. I can't remember the details of the turbo, I think either GT30 or 35 (The one Paul had? ) the pistons I am looking at are 8.0:1, or i could get 8.5 or 9:1? Is it a matter of how much boost i will be running? Becuase Im really not too sure at the moment! Thanks for any help! Dave