For a S/Steel manifold, should I go for an R32 one as I can only find ones for VR6 or R32 engines. Any links to 4Motion ones would be great 
You will need a VR6 one, 4mo or R32 will be no good
You sure Wayne?
I thought the head flange faces were different between 12v and 24v VR6/V6s?
I'd have thought one of the specialist R32 type conversion manifolds are the way to go.
Although the R32 and 24v V6 have different inlet manifolds, I believe the exhaust manifolds are the same - so a 6 branch for a R32 conversion should work.
You may even find that 24v cast manifolds mate upto 12v downpipes...I don't know.
Why don't you want to use the standard manifold/downpipes anyway?