My Gibson "Extreme Dual"system sounds pretty good. Its not too loud at idel, but when you hit about 1500 rpm or higher, it roars. The Gibson system is also pretty good in the cab, not too much sound inside. They also make a system that is like the Ford Ligtning system. The tips come out in front of the tires on the passenger side. I think its called the "Super Truck" system. But its also alot louder with more rumble. Check out
www.gibsonperformance.com.
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2000 Silverado LS 4.8, K&N FIPK, Gibson Extreme Dual Exhaust, Line-X Bedliner, Black Speed Grille, Viper Alarm System, Custom Audio system.... (need to update my pic)