I have a chipit chip and scotts rod 3" exhaust on my Colorado.
Exhaust is fantastic, $799 delivered and would certainly reccomend.
as for the chip....do some research, basically there are two ways of making power on a diesel, 1 is add more fuel pressure, 2 is inject for longer (at same fuel pressure). Both combined with more boost to keep the exhaust temps down.
If I had to buy a chip again it would be a unichip, they are miles out in front of any others in the market, they not only raise the pressure but also increase the injection time and allow you to change the injection timing (start/finish injection earlier) combined with 3D mapping.
No others as far as i'm aware offer that