I have an 04 5,4lt 3v f-150 with true dual magnaflow mufflers, and I love them they sound great for the most part and have livened up the throttle response a little, not as much as the pregrammer though. The Problem is that the exhaust on the right bank has a chirping sound after the engine has warmed up, and I was condering having my local exhaust man make an h pipe for me to equalize the back pressure. Do u think this would work. Any other advise would be greaty appreciated thanks alot.

 

I don't know about the chirp, but a crossover typically is recommended for duals.

Personally, I like x-pipe crossovers.