I may be mistaken but I believe 600's are a little louder than most other bikes when uncorked also, just something to consider. Does LV not stamp their Db rating on the pipe?
Singles and twins both seem to read louder than the multi's, if it seems really loud at home, more than likely it'll be close. But most of the ones that have been, didn't even have any packing left.
a new full exhaust on an R6 will be fine. If its new to you, but used and i mean really used (like mine), it will be alot louder.... but i still pass. Leo are on the quieter end iof the scale as well...
Youll be fine...just dont bring it to mission.
where is mission and do they have track days?