Then likely something like this: 200-500 pounds for a car, 50 pounds for a used turbo. Weld it onto the manifold. 25-50 oil feeds and return. 50-100 for some exhaust piping. 25-50 for a fpr to raise fuel pressure a bit. 50-100 for a intercooler and some piping. I have no idea about insurance as i dont live in the uk.