'02 GTP Mods are: Canned tune, Headers, Colder plugs, 3.4 Supercharger pulley, 180* thermostat, Stock airbox with K&N filter. I run 93 octane exclusively. I see a degree or so of KR at 3500 rpm, but as I get closer to redline it goes up considerably. At 5500 rpm I get 6* or slightly more. I really don't rev much higher than that because I don't want to destroy my engine, and it's not necessary for any legal driving conditions. Should I be concerned? Will a dyno tune help? Other mods?