I am pylon racing in an upcoming event. The plane I will have for

the race is an aresti (40size). My question is the best engine for

this plane. The rules require us to use only up the kits

recommended size engine which is up to .58 2-stoke or up to .72

4-stoke.These are what I will have to choose from

OS46FX
Saito56 4-stoke

Which will give me the best overall performance?

Thanks
David