Anyone have any experience with this tuner? Can A/F ratio be adjusted? Also, can it be used to diag and clear codes? Can it download updates? I have a 2001 Camaro SS with only 4,0XX miles. Only mods are SLP lid and GMMG cat back. With tuner I would run 160 stat. Future mods may be Edelbrock shorty headers (need to retain cats for emissions) and SLP 2.5" Y-pipe. Is this tuner worth the money for a realtivaly stock car without LT headers, larger MAF, and head/cam mods?