So just to add, been doing a bit of research over last few weeks. Ive looked at the Garrett T3 from RS Turbos and looks like that has a limit of 220bhp. A larger wheel here and there will not only increase air flow but cost aswell.
​​​​​Im considering buying a donor engine and transplating the bits from it to my zetec. Does anyone have any ideas on this?. Thinking a 1.8 Audi,