Theres a old post on here or in general discussion about the Performance Ford S2 running 258bhp on a standard turbo, Jamsport Head & Matched Manifolds (standard ones), 285T2 cam with a Pro Alloy Cooler and Gotech.

It did 258bhp on 19psi with a standard bottom end and standard turbo. Got the magazine with it in too.

Couldnt see how a standard turbo would flow enough for that power but there was a massive debate on here about it with the PF boys saying it was definitely true.