i experienced a significant power increase in the upper RPM's with the pods. so significant of an air-flow increase, that the bike would just fall flat around 5K without bigger main jets.there is something to be said for stock airboxes..negative pressure is created behind the engine when moving..this is where pods are trying to pull from.an airbox is desighned to overcome this and also feed all 4 carbs with same pressure..i know there is merit in pods but an original intake setup only lacks in velocity apperture opening size..easily soughted with aftermarket air cleaner and velocity ring.just my 2 cents