armody: thanks man... just take note... the AXE Rossi R65 which I have in there wont fit the standard firewall mounting holes... you can see this one is at an angle... we had to drill new holes to mount it... the thing I like about these engines, they have twice the HP of any other engines in the same size category... this seems to show when one flies... the engine has endless power and never seems to lose any either... but also could be that its being overpowered, the plane now that is... it only needs a 55AX... but I like the sound with that pipe also... all and all I think anyone would enjoy this plane, no matter what engine is in there even, but I wanted mine to be faster than normal so I opted with Rossi...