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I run duel exhaust with Dynomax Bullet mufflers. They look like glasspacks (for when the cop shines his flashlight under the truck), but they are not packed with anything. They are "D.O.T." legal, but in Texas they are not technically "street legal".
They are used by racers that need mufflers for a muffler class.
To give an example as to the difference between these and glasspacks;
glasspacks are 18 inches long with 2 1/4 input and output. They are a little longer for 2 1/2 input output if I remember correctly.
Bullet's are 12 inches long with 2 1/2 input and output.
They rumble at idle, and sound like the world coming to an end at WOT. Depending on how you route your pipes you can get some serious resonance, but I have found that at 65 / 75 mph there is barely any resonance in the cab. At 40 with partle throttle when you talk it sounds like you're talking through a fan.
/end ramble (Since I've put them on, I've fallen in love with them!)
Todd
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