I've had experience with Flowmaster Delta 40's and Super 40's on my 2016 Challenger SRT392. Both mufflers had similar "quietness" at idle. But cruise, part throttle, heavy throttle and WOT were different between them. The Delta 40's cancelled out drone at cruise and part throttle acceleration, but was TOO quiet at heavy and WOT. Completely took away the car's personality. Inevitably I switched to the Super 40's. I could hear the exhaust at cruise but still without any droning. And under heavy or wide open throttle the exhaust had a deep throaty rumble.
The difference between the two products was that the Delta 40's had a smaller case and more baffles within. Whereas the Super 40 had a larger case made with thicker metal and less baffles.
The decibel level of the muffler will be influenced by the amount of noise cancellation factored into its design.
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Raffi R.
1968 Firebird: 350 .040 over, #11 Heads w/2.05/1.66 valves, Tomahawk TC-03 cam (214/221 flat tappet cam, 112 LSA, .0450/.0465 lift w/ 1.5 rockers), 200-4R w/3.55 gears, Street Demon 625 w/ Edelbrock Performer, H-Pipe dual exhaust w/Delta Flow 50's.
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