I just bought a new Walker 18hp with the 42" GHS deck. I love it so far. I demoed the 52" mulch deck on it for about 3 days last week and it seemed to work good. A little more power would be nice with this deck. I was told that the 20hp kohler and the 18hp were the same engine just the 18hp is detuned. Does anyone know if this is true and if anything can be done to turn the power up on the 18hp to make it a 20hp?