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17s or newer. They have apparently locked the ECU with some kind of password or something. HP Tuners software can unlock it if you have a tuner who uses their stuff. The handhelds like Procharger sells with their HO kit can't tune a 17-up Camaro so they have you send them your ECU for a re-flash. It isn't uncommon, manufacturers have been doing this for years. It would sure be nice if they had a performance tuning partner program or something so we could massage the tune and keep it under warranty if done by a partner or dealer.
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