its a proper laser cut merge collector will take a photo down the outlet tomorrow.
the inlet manifold isn't finished yet(still waiting on parts)
-using a cylon(chris)oval port(can use round haven't stated yet) flange.
32mm id alloy tube(still trying to get bends)that goes over the rocker cover to the other side into a oem plenumn using a GM throttlebody (50mm?)(can't remember).
the idea was to keep runners skinny(not to skinny), IC pipe to match throttle opening, have the only step in pipe ID from turbo outlet, to minimise lag(for want of a better term (pressure drop?))
anyway EX manifold is fully TIG welded, all arms were welded off the manifold too minimise stress on joints, all tacked up,then welded onto merge collector, then removed from head flange, arms made even(flat)then welded(bolted tight to head)to flange. has been painted with heat paint.
the 2 bolt holes were on the T25flange, you could run a brace off it but i think i could stand on it (steam pipe is strong).