Hi

Concerning the combustion chamber fuel injection: it does preheat the fuel a lot better, however over time these injectors had a habbit of burning up.

As to the ECUs: A friend of mine ran various tests with projet ecus, also the 4.0. It really bust into the radio and reduced range, whereas on the projet he was able to wrap the antenna around the ecu (!!!!) without affecting the range when turned on.
You simply cannot deny that fact. I also know of many who have lost their jets due to that phenomenon. Others have been runing JetCats forever without problems....i guess you sorta gotta luck out.
Something that might be another factor: here in Germany we run on 35MHz. I believe the US has 75MHz. This difference might have other results concerning the JetCat interference....

Greets
Hank