I've got open air boxes on all my bikes, because that's like the thing you do to every motorcycle. I have K&N and MWR. Remember both are oiled filters and it's a messy thing.
I have read countless threads, anecdotes, actual comparison studies and watched the videos. We swap out to open air boxes so we can listen to the intake. It doesn't really add much in the way of power, and often times will actually decrease power. A well designed air box can cause pressures to rise and stuff more air into your intakes. Opening the air box removes this harmonic balance from the equation.
Many many many people have shown that a stock Ducati air filter can actually flow more air through it than a properly serviced and oiled K&N filter. They definitely protect the engine more.
If I was purchasing it for the cool factor and was keeping some of the box, MWR. If I was purchasing a complete air box delete from the ex company TPO, I would for sure get a Beast kit with the twin K&N stacks.
If I was getting my bike dyno'd or tuned I would ask the people doing the tune which they preferred.
I say get whichever you prefer. If you want to hear your intake roar and want to save a money, get the K&N, if you think the MWR kit looks better, get the MWR.
When it rains out my MWR kit funnels water directly into the intakes of my Paul Smart.
Have considered checking to see if you can tune your velocity stacks? Doing so won't really add any horsepower but it can change the powerband.
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