new rcmk engine set up?

hi i have just brought new rcmk evo rear exhaust engine and was wonder if any one could help on best pipe lenght to pull max revs the pipe is rcmk, and also the mixture 4 high and low screws, i am running it in hydroplane, and also wat would be ideal prop 4 corsing and speed run, thanks 4 help...
ken

None of us here in the states have even seen the NEW RZ rear exhaust engine ?
That said, pending on pipe used ? .... ( Rear Exhaust ) measured is a straight line from exhaust flange to END of pipes band @ 11 1/4 to 11 3/4" is pretty typical

hi i am not shore on were ya measure from, wat part of the pipe is the band

thanks luppy

band is the biggest diameter in the pipe