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Bigger pistons like 96 mm will bump up the power by increase displacement and will work with the stock FI system an increase in compression will also help but you may need to run higher octane gas if you do that.
also consider having the MPS fine tuned for performance. the MPS was originaly set for real gasoline, todays government mandated oxygenated crap gas (thanks corn farm lobby) not only cost more, delivers worst milelage, it as less energy content that real gasoline. The MPS needs to be corrected for this new gas, just as n carborated cars, that require bigger jets for the new gas, the mps needs adjutment to give te optimal mixture. use of head temp, and wide band O2 gages will assit in tunning for optimal performance without destorying the motor.
use of an electronic ignition rather than points will give a a better spark and help insure timing stays dead nuts on target for best performance.
Of course all engine parts should be carefully balanced. a more gressive cam will also offer power increase . ElginCams offer a nice performance cam for the 914 that runs stock D-jet.
with more power you may need an extra oil cooler to keep temperatures reasonable
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