I have the Flowtech Warlock mufflers on my '84 but they don't have the detachable plug. I can tell you that when you have the plug in the mufflers sound great, have a great tone and aren't very loud at all. They sound about a little quieter than a Flowmaster 3 chamber muffler.
If you want something that won't give you a headache when driving but sounds good, those are great mufflers. I have an offroad h-pipe and headers and it has a snarling tone when on the throttle, but are fairly quiet when cruising.
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2005 Suzuki Hayabusa GSX1300-R
1980 Ford Thunderbird - 255 V8
ported heads, 5.0L ported stock headers, O.R. H-pipe and Flowmaster 2-chambers, dual roller timing chain
hi-po Mack Truck hood emblem 
1985 Mustang GT 5.0L T5, F-303, GT40p, headers, off-road h, flowmasters, MSD stuff, etc.
Sold 02/06/04 
1989 Mustang GT ET: 13.304@102.29 mph (5-24-03)
Sold - 1998 Mustang Cobra coupe, 1/4 mile - street tires: 13.843@103.41 (bone stock)
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