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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...

Anyone have any experience with the MIVV GP Pro and No-Kat Pipe? I eventually want to add a Rapid Bike EVO which I know would be best if going beyond just a slip-on muffler but not ready for everything all at once. I also like the look of the Competition Werkes GP Slip-on with the option to add...