There used to be a place to get decent pistons for the 2.0L Zetec bottom end with the 1600 RS turbe head. The compression needs to be lowered from about 11:1 to around 7:1 or the sheeshkas will blow to shit. The source was a european company called Mahle, check them out, I've not played with cars for a while cos I've been medically banned from driving for over 5 years, as the scousers say, no need mate. (Mahle Pistons!..)