It was really easy, The manifold for the Itbs was made so that one end was the head flange and the other was 4 seperate flanges for each ITB. So I cut the honda head flange off and machined the manifold down to get the runner length I wanted, I then cut the manifold so I had 4 separate runners and made a welding jig that the 4 ITBs flanges bolted to that spaced the runners from 94mm (honda spacing) to 97mm and welded it back up, The port shape isnt quite right so need a little porting and filling with epoxy to get the port shape right.
But owes me approx 700USD, still need to get a TPS though