Just as longer intake runners improve low end velocity into the combustion chamber, longer exhaust runners should have the same affect in the transition into positive manifold pressure. I like the length, and the numbers certainly show it's a definite improvement, but I can't say I'm a big fan of the Nurburgring-Carosel-esque bends right off the #4 runner, Terry. Of course, only having two dimensional pictures to consider it, I suspect that's all it is. Tigs looks pretty clean too. One hell of a first time out project for a relatively new tig welder, imo.

Nicely done, sir.