Get an RXP nozzle, drill out the boss for the Trim unit, buy a trim unit. you can either buy the new 4tec ones, or an older 2stroke one, they're practically identical (I run a 2 stroke unit on my 4tec). You'll have to build a set of buttons to control the motor, or do it manually every now and then. I can tell you how to do both complete with relay and wiring diagrams if you're ambitions/handy. Check out my Challenger 4tec Upgrade thread for detailed pics on how to do all this. It's somewhere in the thread. Lots of details.