To start, I am new to my MTS1200. So please excuse my ignorance. More of that later.
Second.. I am not new to bikes (20+ years of street bikes), racing, or road tuning and dyno tuning my bikes.
Third, I started a similar air box mod for my 07 FJR1300 about 5 years ago. It added substantial "free HP" to the FJR's. although, it did stir up plenty of Nay sayers on the FJRforum (Even a young lad who did my mod improperly and tried to blame me....dipsh*t). Until dyno results were posted. Also, I pioneered a air box opening mod on the Victory M/C sites (TheVMC & TheVog) for my 2010 Cross Country / Crossroads. Also, heard some nay sayers there too.. BUT was quickly adopted by most after the dyno results were posted. SO I WHOLE HEARTEDLY APPLAUD THIS EFFORT! GOOD WORK AND THANKS FOR SHARING!!
Fourth, What I am getting at.. Letting in more air is always worth it. So long as the bike can utilize it(which the MTS1200 obviously can). This along with less exhaust restrictions and the right amount of fuel added. Both my previous FJR and my current Victory Cross Country had traditional air box's. No ram air systems. They benefited greatly. All across the RPM range.
Finally, Does our MTS1200's have a true ram air system? If not, I am all over this mod. IF SO... I am not going to be a nay sayer BUT the benefits stationary on a dyno might be negated by losing the pressurized air box at speed.. BUT.. IT MIGHT NOT. Remember, a dyno test result will never duplicate the benefits of a pressurized air box. If our MTS1200 do have a true ram air system.. The only way to know would be to take two (say stock) bikes and chop one air box (dyno shows even chopping it without mods adds power). Run them side by side at speed.. Say a Fourth gear roll on.... See if the chopped bike falls flat on its face at speed compared to the intact air box.
Another concern for a chopped air box on a MTS1200 would be to not do any water crossings with it if you were to be "off roading."
Sorry for the rant.. Thinking out loud with my fingers.
"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf."-George Orwell.
"The United States of America: Land of the free because of the brave."-Thank a Veteran everyday.