Just re-reading your thread, I am wondering what exactley is cracked.
You said manifold (which is a technical job under the engine) but you also said 'can' (which is a piece of piss to fix at the back of the car)
Do you know where it's broken or do you just know it's cracked somewhere?
<span style='color:blue'>"So my BM makes me a flash bastard? Then I guess you're just keeping it real from the seat of your nova?"</span>
<span style='color:gray'>"...and the home of the brave..... is bravey 130bhp from a 7 litre engine? 100bhp/litre or don't bother building it!"</span>
<span style='color:red'>"Aaahh the UK; where every road is jammed, under construction, poorly maintained and unfairly policed, at least we don't get over-taxed for it........ HA HA HA!"</span>