Don't go the pacesetter route honestly, yes they work great, but cost a good bit of money. I did this because at the time there weren't any good 1-3/4 x 3'' header options available.
If you absolutely must be different then wait a few more weeks when JBA releases their 1-3/4 x 3'' Titan headers, they look great and have Vbands. They will also have a midpipe section.
However, i'd just do what Cajun (jeff) stated, go with the JBA 1-5/8 x 2.5'' headers ceramic coated and call it a day. Locate the AFR sensors in the header collector which there should be provisions already there. Then go with the cajun 2.5'' catless or catted B pipes, (also resonated available). Use his 2.5'' to 3'' Y pipe kit and over axle setup with a JBA muffler or event better a Borla XR1 and vibrant ultra quiet. That is the number one proven solution for performance and sound.
Plus get uprev and you will have completely transformed your truck.
The pacesetters I did do look great but there are also things I don't like about it in terms of how the B pipes had to be routed under the crossmember, this was due to the fact my headers weren't test fitted on a titan prior to installing the collectors. Plus the collector pair cost more than the pacesetters... it was an expensive job.
I'm planning on going with the JBA 1-3/4 x 3'' when they come out, but i'm also heavily modified and don't really use my truck as a ''truck'', its more of a fat 4 door sedan that has a bed now.