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Im sure the small hose that goes between the inlet to crossover is a different size
That correct you will need to buy a 70mm diameter peice of hose to fit over the crossover pipe and EFI throttle body. Thats assuming you have an EFI inlet manifold? As your rocker cover should be 90 spec you can use the standard rocker cover as they come with the wider lugs and are the same as the fiesta ones. The other boost hose should fit with a bit of persuasion.