IS THEIR ANY ONE OUT THERE WHO USED A VP-30 regulating pump on a 91FX ???????????? and with a slim line pitts muffler did you hook up the muffler pressure to the tank or not

would like to get it together in the CHIPMUNK so I can fly it soon............THANKYOU.....
WHAT was your RPMs and what props ....I will use 14x6 MS....
DID THE PUMP FIX THE PROBLEMS AND MAKE IT INTO A REAL POWERHOUSE????????