If your going the PC route do the 1+2 filter/snorkel out and the holes in the air box(you can buy rubber bungs to fill in later) and then give it some thought apart from the curiosity of how the bike would run with a 2/1 I've lost interest in the motor it runs that well,all the advantages to be had are in chassi/less weight and brakes and as I've found tinkering with different tire combo's