Heard good reviews about the MK2 Ramair filter , best find out how that effects warranty 1st great if you want to keep the stock look , other options are Kand N pod filters , then there's
@ozrider ozclaw and multiple others , i did this with mine:
http://www.r3owners.net/threads/todays-mod-triple-filters.22503/
i like the look of it and it seemed to make throttle response a bit snappier.
As for restrictions once you have worked out filters and exhaust im sure the Meister Map slinger
@HansO will set you straight mate.