Those Trapps are not welded to the bikes pipes. The weld you see (the black painted weld) is stock on the Vmax. The Trapps are just slip-fitted to those pipes, and when installed they expose the Yamaha factory weld like you see. The stock system has this kind of chrome cover on the rear pipe system that covers the black weld area so you don't see it (looks more finished than the aftermarket system). You'll need to tug, pull, wiggle the SuperTrapps off of the pipes. But they use no clamps or anything. Simply 'pushed' on and then secured with the botls that hold them on to the footpeg brackets (I had Trapps years ago on my old '88, so I know for sure).
If you want,,,, then loosen the head pipes from the engine a bit and the loose fitting will now make the SuperTrapps come off easier, because when installed, they 'hang on tight' and are a bit hard to install/remove. You're still going to need to pull, wiggle, etc. them off of the bike. Especially if they've been on there a longggggggg time.
Vinnie