Got the non-air tube converter on and went for testing.
SUCCESS
HC = 0.161 on 0.407 std
CO = 0.749 on 3.804 std
NOx = N/A
I got a good deal on a unused, 2½" converter for a 84/85 TR. It's a Dynomax #15146. I had flanges made up and put them on using band clamps, so I can change them later when I change the DP or exhaust. So now I'm emissions compliant, but can still get rid of all that tubing, valves and pump.
