Nope...no 'restriction' as such, but there's always the point about how much energy the extra chambers absorb, which could be used in the sucking and stuffing. Most tuners claim removing the side baffling has an effect (KR-1's/RGV's/TZR's etc. all have a similar thing) but I've never actually seen any proof.
Andy mate.....there are too many hours in a day for me at the moment
