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The days of "buying a chip" are over. You will need to buy a scan tuner or pay someone to put a dyno tune on it.
To answer your question, yes, GM left 40-60hp on the performance tables just sitting there waiting to be unlocked. Same thing with buying a cold air intake from a reputable company like CAI or Rotofab, easily pick up another 25hp. From there you get into exhaust and headers for another 40-60 and you're done with bolt ons and need to open the motor.
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