My OS is not on a pipe, I'm using a pitts style muffler with the reducer tips cut off and I'm using 30% Heli Cool Power
I'm having issues getting enough fuel to it at WOT but I think I have that corrected (I think) I'll test this weekend and post my results. I'm putting a pump on the system...I didn't want to add back pressure to compress the tank Psi because I would loose around 400-450 rpms as that is what that engine gained by removing the small exhaust tips but it obviously also lost the required tank psi to properly fuel this beast at WOT, so the pump was a easy decision.
I'm also not sure that I will stay with the 30% heli as I'm still testing things.
Shayne
PS....KennyMac....
That was a good post!