well if you arent sure, dont ride it too hard and check your plugs regularly to make sure you arent doing noticable damage. If it looks overly white or even worse pitted then you should stop otherwise you might damage to your valves.
I think it would be amusing to see just how much of a difference changing the air filter cover would make considering how naturally rich most v-twins natively run.
The main thing is that you are leaving the airbox pretty much intact which is where it appears that the majority of backpressure is happening.
Of course this comes from years of tinkering on carburated bikes . Many tuning techniques for those engines would be considered downright barbaric as opposed to these new-fangled fuel injection systems.
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