There has been very little action on this thread. I have my 121VR running very well now and am looking for your advice on pipes. I am using the Reedy 2035 pipe right now and I was wondering if there are other pipes that improve fuel economy.

I am using the 7.0mm veturi and P3 plug with 0.50mm shims. What changes would impove fuel economy? I am running my RC8.2 with stock ring gears and 44/16 spur/pinion. It runs great and I am consistantly getting 9:15 run times per tank.

I have a 6.5mm veturi on order and could even increase to a 17t pinion. What will these do for performance and fuel economy?