I have both the Mecoa/Megatech/Leo/? as well as a Norvel AME .15. Both are good runners. The Norvel seems to have the power edge. I do however have a Macs pipe and adapter for the Mecoa (not tuned yet) and expect this combo to be good. I ran the pipe set up and it is loud!
I had the Norvel in a HOB Spacewalker, That was fun until I lost it in the sun.

Jimmy