I have flow master Am. Thunder axle backs. I get a large amount of cabin drone when rpms drop. Solutions?
Around 2000 rpm? Pretty much normal, because the mufflers are the same size on the new setup, the stock mufflers are slightly different. Try a set of new rear gears to get your cruising RPM up a little bit, to 3:73:1 or you can add a resonator to your exhaust. It's been discussed for years. Check out www.corral.net for more suggestions.
Search Ford Mustang Questions
Ford Mustang Experts