As a follow-up to the helpful suggestions by PTG on the Magnum 36, here are some more questions. I have a new-style square-head 36XLS with ST NVA and delrin venturi, mounted in a Vector 40. Will use stock muffler, not a tuned pipe. Tank will be rectangular plastic clunk. So, (1) Does this engine run best on ram air vent, or does it like muffler pressure with the stock (or aftermarket tube) muffler? (2) Is the .250-.270 venturi suggested by Phil also a proper size for non-pipe use? I plan to use an 11x4.5 TT Cyclone or a 3-blade carbon in the same range.