I have a 2018 RC390 with a full Mivv exhaust and Rapid Bike Evo installed. The engine seems to run smoothly and pulls great in 1st-4th gears; however, in 5th and 6th gears it won't rev past approximately 8500 rpm and will now only hit an indicated top speed of about 85 mph. Any thoughts on what may be causing this? A tech at Rapid Bike told me they didn't think it was related to the Rapid Bike as it doesn't utilize any gear sensor information.