I've decided to build my own manifold instead of buy one. I'll be running a 37r with a t3 inlet. From RRE I bought the mild steel head flange and turbo flange, so I just need the piping for the runners. I've deleted the ac and switched to a half radiator. The bumper (not cover) has been missing for years, so there's TONS of room for me to do what I want, which is basically a straight shot with very little bending needed for the runners, each being about 12" long.
1.75" ID is a perfect match to the head flange. When porting out stock manifolds, it's always been my understanding to port the runners out larger instead of a perfect match up, creating a small step in the interest of preventing reversion. Does this mean I should go with slightly larger ID piping?
Every manifold I've seen has the turbo flange not parallel with the head flange. All I can seem to find are manifold designs where the runners have to do at least a 90 degree turn. Wouldn't a straight shot design be superior?
I've searched around for piping and this looks to be good... Any thoughts?