I installed true dual with flow masters and the only rattle I get is from the exhaust itself only when the a/c or defroster is on when the rpm drops slightly. I guess I have to add a hanger midway up the car. I can use a pry bar and push slightly under the exhaust and it stops. It is not hitting anything but it's annoying as hell and slightly embarrassing while sitting at a red light with a/c on. I'm in Texas
so a/c is used 11 months out of the year.
---------- Post added at 12:26 PM ---------- Previous post was at 12:25 PM ----------
The only other rattle I've had is the auto window control panels rattling. Never the mirrors as I've had other people comment on.