Hardly at all...instead of displacing .128ft^3 it'd displace .1ft^3 adding .028 to your net volume...hardly a change in tuning...take those numbers with a grain of salt though.would that mess up tuning at all
i agree, only reason for a ring in your case is if it was actually touching the port wall but one inch away you ain't got to worry, since it vents through the sides.No you are fine, as you said the sub vents out the side, an inch is more than adequate clearance.
You're fine.its actuaally only like 1/4 inch off but not touching is that still alright