Nelson performance is what most people here use. He sells turbo kits and has experience tuning turbo motors as well. I would go ahead and get a tune now, and then just have him retune for the turbo. He charges a more to tune highly modified vehicles (like one with a turbo) than a lightly modified or stock one, so you could just pay for a basic tune and then pay the difference once you get your turbo set up.
04 CCSB Silverado Z71
- 5.3L
- Nelson tune
- Pacesetter LTs and ORY
- Corsa dB black
- LS1 fans
- 285/75/17 Toyo Open Country A/Ts