Exhaust manifold design

[Uberderv]

I am open to generate any CAD drawings like the manifold

I would use 1.25" sch40 pipe only because I had to buy 6m of the bloody stuff last time, it would be heavyish but not alot more than the cast items already fitted.

I know there are far better designs out there but this seems like a good compromise between original mani with extension and custom equal length etc.....

The Steedspeed manifolds look great and if you had access to a CNC you could design one for our engines. Im just looking at this from a DIY point of view and what tools I have in the garage. A tuner made 250hp using the original manifold but I bet the EMP was through the roof.