So, i work at a gm dealership and i hear all kinds of crap from customers who think they know it all. But occasionally, i get a guy that knows his stuff. But today i was intriguied by a statement by a customer, but i was busy and didnt question him on what he was saying. He had an 11 silverado 6.2 which had been tuned by a local tuner with hpt and was spraying a 150 wet shot. He seemed to know quite alot about the tuning process. But he made the statement that had "a relay wired up that was turned on by his nos arming switch which retarded 8* of timing, and when the nitrous was off, he basically had an optimum n/a tune." Is this even possible? I didnt think the gas burner computers had the ability to "switch tunes". Just your basic high and low octane tables dictated by the knock sensors/determined octane of the fuel.