Ths may be a goofy question, but I'll put it out there anyway. When I bought my 2012 20SLI it came with a 2012 Merc 75. The dealer told me that the engine was the same as the Merc 90 and 115, but that it was 'de-tuned' down to 75. If this is the case, is it possible to 'up-tune' it to the 90 or 115 mode. Does the dealers explanation make any sense?