I just installed MFlow on my V6 Coupe. Getting alot of resonance from 1500 to 2200 RPM. Will Dyanmat help? Where should I concentrate the install? In the truck or back floor? under the heat shiels under the car?

 

Turn the radio louder or roll up the windows lol. If you don't like the loudness from the after market exhaust then just put the stock one back on. Even if you put dynamat under carpet the whole car you will still get some noise from the after market exhaust but it will help reduce some.