For certain cowlings this 180 degree tuned manifold might fit
better. It is more compact. It is based on a 3 inch center line radius 180 degree
2" tubing bend. the center line distance is 6 X 3.1416 or 18.8 inches.
We need 24 so this comes out about right.

It is easier to make as there are fewer
tig welds than the front mounted configuration.

It is also really trick looking :)

Paul Lamar