I am new to the diesel world and I'm looking to upgrade my truck. I just bought a 2008 chevy Southern Comfort with 62k miles. I'm looking for some extra MPG's and some extra HP. I have read a lot about the EFI tuner and how most people say it's the best tuner for the Duramax LMM. Does anybody know if there is anyone that sales this tuner close to Easley South Carolina? Also can I run this tuner with my stock exhaust? I read that anything over 100 extra HP will cause issue with my trans. Has anyone found this to be true?
Thanks
Thanks