Mert, with your pipes, you will gain some 3 to 5 *free* HP by popping the rubber bits out of your airbox. Also, because the engine is not working so hard to pull the air in, you will probably see a small increase in you highway fuel milage.
For those already bored out to 904CC, how does your bike do on middle grade fuel? A WAG is that your compression ratio is around 10.5:1 now unless the new piston crowns are lower than stock.
