I currently have Accurate Exhuast ACMT-912 A body performance mufflers. They have a nice muscle car sound and not too loud but they drone badly on my 67 GTS. I need to change them to a muffler that won't drone on the car. 2.25" from to back with stock exhaust manifold. I just want to change the mufflers. I wasn't considering any cross pipe install. I've read a number of the posts on mufflers and have a idea of what I might do but suggestions for my specific setup would be helpful.