truggy motor question

with a 9xl, MM, 4s....would i see performance somewhere close to what a nitro set up would be on a track??....I don't need to have the fastest truggy out there but would like to still be competetive and in the ballpark...
any idea of what i should start with gearing ?? should i start with changing to the 46t kyosho spur as opposed to the stock CRT spur ??...thanks again for any help