It would be interesting to see how much more length of the 1/2" pipe you need to get the same contact time with the higher velocity in the 1/2" pipe.
Ill second @ds960 on the trans cooler. Mine gets here tomorrow.
I followed @brownfox thread on the topic for the most part. I think in the thread he mentioned that he was going to go with a copper manifold. Never saw if he did switch to… or add a manifold to his system. If so it would be interesting which one he found was most effective.
Sounds like DS960 has had better results with the trans cooler.
I went back and forth and decided to go with the trans cooler in the end.