Ryan,
How about last spring on that run from Dahlonega to your house. Were they ringing when we got there?
If not, then the change in your pipes is probably the cause.
If so, you probably should get some custom earplugs with the electronic dampening. Probably about $150 or so. I am seriously thinking about making that plunge.
Shoot, with your NASCAR connections, you should be able to get a free pair!
