i have a 12 TUP evo 2 engine....felt i was loosing compression on the piston... so got my self a AAC piston from the 12 tup version. 5 port. The guy at the LHS said it would fit since the dimensions on it were the same as to the normal one and the ports were okay aswell.

They were also similar to the M. Collari pistons that was with this guy. It seems like most of them are of the same dimensions.

anyone ?