Will I be happy with a 07 Cr9040 with the 9l cummins engine. I am thinking about trading my 04 Cr940 with the 7.5 Genesis engine. Dealer told me I would have more power but I have seen complaints about the 9l cummins. I have also seen that the 07 9060 has more power than the 9040. Is the engine the same between the two and just "turned down" ?