I like the Amercan Thunder. I has the Delta Flow technology so it is not as load as the original 40's. When you want it to be quiet just push in the cltch and let off the gas. 
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Steve Stumbaugh
89 LX 5.0 5sp, Removed air silencer
Mac High Flow Air Filter
Motorcraft 8mm wires
Autolite platinum plugs
Mac O/R h-pipe
Flowmaster American Thunder
3:55 gears
Accel Super Coil (42,000)
75 mm Mass Air Meter
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