In 1992 I brought an Astra 1.7td It had a powerful turbo on it( Izuzu Engine) I now own a 1996 1.7td Same engine but not so powerful can i swap the turbo for the bigger one . The engine is not the vauxhall lowblow one. Apparantly Izuzu had a smaller turbo fitted to the later models why I do not know. Does anyone know if i will have to change anything else i.e fuel pump air intakes etc ?