I am a relative newcomer to the gt forum site but have used it extensively to research the various quirks of gt ownership. I had a bumper delete and Hennessey exhaust installed after purchasing the car from Shelby a few months ago and had the opportunity to run several tanks of fuel through it in Jan in AZ.:driving: prior to bringing home to the great white north. Although there are a number of posts in the tech section regarding exhuast "droning", it appears that there is no consensus as to which exhaust does or does not drone. My system has a terrible drone from around 1800-2100 rpm..:ack wether under load or not. I realize some will advise that the soution is simply not to spent time in this rpm zone...agreed..HOWEVER , when I am enjoying a leisurely drive with my wife it is somewhat difficult to avoid and has become an issue for her (along with the lack of cupholders but that is whole 'nother issue::slap) Has anyone experienced this problem with the Hennessey system ? Are their any simple solutions ? I am otherwise infatuated with the exhaust note so I hope the remedy is not to revert back to the stock exhaust!:ack . Spring is coming and I'd like to remedy the situation sooner than later.