So went and picked it up today, got it pretty cheap so no worries if its junk. Here are some additional pictures. Small dent on the rear #1 runner.
Are the holes up on top something to do with emissions? Maybe some kind of EGT or O2 sensor ports?
main pipe to muffler measures 2.25"
runners measure 1.65" to the collector
Exhaust ports 3 and 4 measure 38mm
Exhaust ports 1, 2, 5 ,6 measure 30mm
'76 280Z "Banzai Runner" GNOSE Custom Widebody
Stroked Rebello 3.0L, P90 Big Port Rebello Head, 279/487 Rebello Camshaft, Kameari Intake manifold, Triple DCOE 45's, Electromotive XDI, Headers / 2.5 Exhaust, 3.9 LSD R200