i was wondering if gettin a 3" center/center hooker aerochamber muffler for my 5.9L r/t would sound good and have good airflow? it also has edelbrock LT headers and Y-pipe.

 

I like mine, no resonance inside the cab at all. Very quiet at idle but sound good at full throttle. Mine are on a 1970 Dodge d-100 shortbed with a mild 318 with headers and 2.5 inch dual exhaust all the way out back.
I've been very happy with them. Highly recommended.