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Honda vip box (not much vip but free beer, so no complaints)

You will find all bikes lose power at the top past peak power. It’s caused by lack of flow, this can be both inlet & exhaust combined &/or either individually. The primary suspect here is likely cam overlap, as Honda tuned the 6th gen inc Vtec for more torque, which you can see in the graph & people often think it feels sportier due to the kick in power when the Vtec chimes in with the other two valves. But when you look at those overlaid graphs, where 5th gen pulls ahead on power from 6k/rpm. How often do you ride below that rpm when it will matter ? Only when tootling along, so it’s inconsequential. Unless like Honda you are or as they did listened to those lazy riders that don’t know what a gearbox is for & decided to try to add torque. When what the lazy riders wanted was a 1000cc+ Tourers worth of torque from a bike that was a middle weight do it all bike. So a bit like those tourers that ruined the VFR, if you want touring torque for 2 up luggage carrying, then buy a 1000cc+ tourer, if you want flat out high rpm sports ride, then buy an Aprilia RSV4 or some other full on sports bike. If you want a good do it all middleweight that can cover all bases, buy a 5th or 8th gen. My 5th gen has been tweaked to be sportier than most, but still a great all rounder. Clean up the intakes, get the shortest velocity stacks in there, then this new header, a free flowing can & some cams if you really want to push the boat out. But remember to upgrade the suspension to match, to maintain that all round package.