Good evening I'm looking to converting my mk7 fiesta zetec s tdci to a zetec turbo and was looking for advice on which engine to use as I've got a st170 engine and a 2litre zetec blacktop I've got mk1 focus rs pistons and going to order forged rods and I've also got the decompression plate as well which I'm going to have fitted when I have the engine rebuild . I look forward to your feedback many thanks