Kevin,
Thanks for weighing in on this one.
I am only using premium in the tank thus far.
The exhaust is tight, but the fit where the header meets the head is a bit dicey.
I lined it up the best I could with all the exhaust components loose, and then tightened it down a bit at a time on each bolt, but I still get a bit (tiny bit) of leakage at the connection point.
Caseman