MCX vs RTP in an X15

[Tristar Racing]

Is the Rtp-1 Multiport or Throttlebody injected?

[Rossterman]

Primary difference is the intake- Block, heads, cam, etc are identical between both. Probably a slight advantage with muliport mcx vs. tbi in the rtp on top end but torque and midrange are probably pretty close. I have the rtp predator and it has plenty of power and runs ~ 44mph wih 4 blade SS prop on 205V (original x-star hull). Some say difference is 10~15 hp in reality. Might be more if engine has the aluminum ETX exhaust manifolds as i understand they scavenge the cylinders much better than stock cast iron manifolds to produce a noticable power gain.

[jason95gt]

There is a difference in years due to the exhaust. The 2009 has a little less power due to the exhaust being more restrictive to make the motor much quieter than the 2008s.