you can smuggle at least one bottle of Whiskey in that space ;-)))
I am riding an LTD with K+Ns for more than 15 years and a B with K+Ns for 4 years now and it worked fine so long. No additional hastle caused by reduced protection.
Even in the worst weather conditions (rain, storm, cold temps, lot of water on the road, etc.) not an issue 😉
Go on and build your smuggler bike ;-)))