So awhile back I purchased a 96 tioga class C. It has a 460 Ford with banks headers and ram air.I have been working thru issues here and there making good progress. One thing I haven't solved yet. In 2nd gear it makes what sounds like an oscillating drone noise till it shifts to high gear then go's away. Bout 60mph comes back,but is just a steady roar.goes away at 65mph comes back at 70mph and gets louder up to 75mph, go's away again at 80mph. There is no vibration in the steering or anywhere, just loud roar. At anytime I lift off the gas,it instantly go's away. So I'm starting to think it could be an exhast roar. So I'm thinking about having the muffler replaced but I don't want to lose the performance from the banks system.