Spark curve is not the only benefit. Injector dwell on the 3.o module should be longer, as well as the fact that the ECU is confused by the fact it is trying to run an engine much larger tahn it is supposed to. Spark timing is not the only reason, but it would be better because you have the major increase in compression. Yes it is possible to make the engine run from a 2.5L module, but it is not the best idea. Basically it is your engine, your cash so do what you want. I have been in the auto industry for about 16 years. I am still Master certified, and have schooling to back the hands on. I give the best advice I can, sometimes the fact that you see just words can make it seem condescending. That is not the case, but I have become very short tempered with some of the situations.
