I thought i'd try a tower muffler on my tt .46 pro. I am running a APC 12x4 prop and with the stock muffler, the throttle response was fine. With the tower muffler it won't go past 1/2 throttle w/o dying. It seems that it isn't getting any back pressure from the muffler b/c when I disconnect the tubing from the muffler it acts exactly the same. Anyone have any suggestions as to how I could fix this?

P.S. What RPM is everyone getting with this engine/prop combo?

Regards,
Philip