I would think this would be something you would discuss with Vandemon directly first. The H2R factory exhaust does that all the time as well. I don't think ive seen a single H2R or Vandemon replica not do that.
2016 Ninja H2 - Worlds Quickest and Fastest. 1/4 - 7.901 at 181mph - 233.6mph in 1 mile. CMP Built Motor, Brocks Performance Stage 2 Package, MC Cycle works Intercooler, Slash-Cut Exhaust, DNA Filter, PC5, Brocks Lowering Links, Brocks Front Strap Kit, BST Rim, Adams Performance Swingarm, Zero Gravity Corsa Windscreen, Evotech Radiator Guard, R&G Undertail