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I have MBRP 4". Just the cheap basic pipe. I'd go straight. Its not really that loud in the cab As someone told me on here once "Pipe is pipe, youre just buying a name" Unless they salt your roads you might want to look at something that wont corrode. Easy to install as well.
I've got the MBRP Dual 4" Stainless kit with their high flow mufflers and no cat. We get a lot of crap weather up here and they salt the roads...... had it now since the truck was new in '05' and still no rust or wear! Even with mufflers, it sounds real nice when the skinny pedal is put down!