mine doesn't have any of that.. mine has machined down original pistons to lower compression, my old one had decomp plate. Other option is 1242 8v with 16v pistons in, makes 7.8:1 iirc - low enough for lots of boost anyway. Should be ok upto 160-170bhp with 16v pistons, i wouldn't really want to take my machined down pistons much further than 130-140bhp though. Not had it on rr but think its about 110bhp atm running 11psi of boost. But my old one i ran daily at 25psi and it was fine (somewhere around 130bhp)