Luca,

Have you ever actually fabricated anything out of aluminium YOURSELF?

No? Hugely qualified to talk about the costs involved then.

Like i say, if i wasn't half way through a house build at the mo i would be happy to design and produce a batch of 5 for £250 each.

Ians prices are high as he has to pay someone else to construct the manifolds. Welding, turning, machining all done by someone else. he has to cover all their profit too!