Cat back or Turbo back on 07' LBZ

Hello All! I am a new Chevy owner. Just traded my 05' Ford F350 Powerstroke for a 07' 2500HD CC 4x4 Dmax...loaded with every option.

I have been die hard Ford for many years, but this was just a logical choice. First impressions I can tell you that the Dmax is quiter, smoother, more powerful, warms up quicker, and has many, many more features for the money than Ford. I don't like the IFS front suspension, would rather have a solid front axle, and don't like the little tires! Otherwise, nice truck.

On to my question. Going to do exhuast first, no tuner. I wondered which MBRP system I should get, the turbo back or cat back? I had heard that a exhaust would cause error codes on the 07? Please provide me with first hand experience and suggestions.

Thank you all.