Been some time riding with the snorkel mod, i feel the need to say that the bike response feels way much better, especially in the range 3000 to 4000 where most of the gear changes are taking place in town. I still use the stock mufflers and air filter.
Riding last weekind in the mountains and playing with the bike with my friends, i admit it uses less fuel than before. Strange but true.
But take care when you jet wash the bike, as i found water in the top of the snorkel.