I installed the Fatshots with 8 discs as per the instructions. Overall I am happy with the tone and power but was kind of hoping for a little louder especially at idle. Will bumping to 10 discs make a real noticeable difference in volume at idle. After a 20 minute ride the discs are dark brown/black and no popping. Is it necessary to pull the plugs to get the real picture of rich/lean or can I move to 10 discs based on the colour of the discs. Also I noticed your dyno graph was done with 8 discs does moving to 10 rob power or does that vary based on altitiude on individual machine (I am in Ottawa Canada not sure of the altitude here).

Thanks for your help.