Whiskey, The basic Jett Quickie .40 is $260.00 + $38.00 for the backplate mount. For a long time the only way it was available was for our 426 Quickie event. Then a year or so ago, Dub made the "detuning" parts available so we could use the engine in our 424 event. If you have the 426 engine, the 424 parts are $35.00, but you can buy the engine configured for the slower event, and then if you want to, you could get the 426 muffler, and venturi. For our 424 Quickie event there is only one prop option, the APC 9/6, so there is no reason for us to experiment with other props. In 426 we use stock unmodified APC props. One example is the APC D-1, 8.8 X 8.75. I believe there is some benefit to practice with something that is faster then your actual race planes. Some things like your race timing will be different, but being able to negotiate the race course with the faster airplane translates in you having more time to master the race course with the slower configuration. If money were no object, you might consider the Jett 426 for practice. I still go back to my earlier recommendation that a Thunder Tiger Pro .46 if you can find one new or used, but not abused. Another option, but harder to find, would be a used Nelson short stroke 428 motor. That event is no longer flown in the US, so sometimes these engines come available on the used market like Ebay. Finally, and this is important, if you bump up the speed with a 426 Jett, or a 428 Nelson be certain that your wing is strong enough to withstand the higher G loading. The Italian Super Tigres were great engines, but they are probably harder to find ones that haven't been run to death.