The bed of the pickup usually resonates with the loud pipes. Makes for the ride from hell on the interstate. Of course, usually these guys have a loud stereo blasting, so they won't notice.
I don't get it either. Loud exhaust belongs on a performance vehicle. On these trucks, the pipes and maybe a K&N filter are the only performance modifications. Here in CA they are all cat back exhaust - they may look like duals out back, but usually they are split from one pipe.
What I really love is the crappy job the muffler shops are doing putting on these duals. The tips usually rust within a year and stuff starts sagging and dangling when the trucks go down the interstate. LOL ...
George