Removed the cat back OEM muffler and resonator then installed a fully stainless cat back Borla system having just the muffler really sounds tight and great. A clean sounding exhaust like a 60's era 289 Mustang with long Glass Packs while stirring the stick plus it woke the engine up big time. Going on 21 years having no rusting out muffler and exhaust system worries.
Much cleaner what i'd call a "tight sounding exhaust" way better than Flowmaster's noise that high school kids run. It has that deceleration rumble trademark sound so cool while in a tunnel. One very slight drone at a narrow 50 rpm range at 2,350 rpm's pulling a grade which goes silent by driving 2 mph below or above the 2,350 rpm or 52 mph zone. Driving at 52 mph, never happen as highway flow is 72 mph. Full throttle with 5,000 rpm shift points will attract attention, cops included but still way below stupid loud without that muddy flat sound of Flowmasters.
I used to get different brands of mufflers free from a friend at his muffler shop business "to test" with Magnaflow being the closest good sounding of a steel muffler to "sound test".
Spintech mufflers really flow but will drone as well catch too much attention floored (cops) behind the 484" in my F250 pick up. I'll get several "that can't be stock" remarks in my D1 if I threw a rev next to another LR or other vehicle I want to play with on the street. Long live the push rod engines. .....~~=o&o>....