Yesterday I picked up my 05'Commemorative from wintering at a Viper-shop and did the first 250mls for this year. I got some mod's: Hi-flow race cats, Borla cat back without X-pipes, K&N, urethan bushings, service and a SCT hi octane tune from RoeRacing. The performance is better and the snake feels more lively. But... I get lots of drone between 2,500 and 3,000 revs which doesn't mean the exhaust is too loud. No matter if top down/up, windows down/up. The drone produces ear pressure on the outside ear of the driver or passenger like at sea diving, up/down higher mountains or flying without good pressure balance. Any recommendations?