sigh... still leaking at the manifold...
the d-side pipe may need replaced, i did some finessing to the cup during install to seal it better (all while completely forgetting i still had that reducer in the box)...
now i put the reducer thing in and it doesnt sit perfect anymore... it still has a very small leak, almost pinhole, but you can hear it whistling while driving...
im gonna play with it some more, hopefully i can get it to seat nicely. the reducer cup sits perfect, but now i think the leak is between the main pipe and that cup... i may ultimately have to call MAC and order a new d-side pipe UGHHHH
thats what i get for rushing through this... i manage to drop the old, install the new in less than 30 mins... and now im pying for it lol