I have a guy that said just $350 for a Dyno tune... Interesting.1000 million times worth it to have it fully dyno tuned. Don't use some cheap $300 mail in tune either. There is no way those are 100% correct for your vehicle. They'll get you close, but you could be missing 50hp for no reason. I do tuning. But I still have my tunes put on the dyno for the final runs so I can 'see' what's going on. Expect to pay at least $600 for a good reliable dyno tuner. My last tune, less then 45 days ago, was $750.
Thank you for your input though. I really didn't know, so I'll definitely be getting it tuned.