I hate flow masters, they sound hollow. They have that Mustang sound. I have Dynomax super tubos with 3" exhaust. Being an old fart I added 12" Summit glass packs because I didn't like the drone inside the car when cruising aroung 2000 RPM. My younger friends loved the sound all the way through the RPM range. When I nail it going on the freeway ramp next to Home Depot, I always get at least one comment the next time I go back to the store.