Hi Larry,
They do still have a small amount of drone, but we have got used to it now.
Speaking with the owner of Rapid Exhaust, he said that these can still be used with other exhausts, and cut out the drone on them.
When I spoke with him about the light drone, he suggested to place a blanket under the spare wheel. This helped a little bit, but I might try some dynamat one day.
I am in Traralgon, 3844, if you would like to have a listen.
Regards,
Gary