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From a pure engine HP standpoint, there are some gains to be made with only a tune. Not a lot, but some.
Tuning is really for aftermarket things. Add a cold air intake? Well, now you've got different air going in and a tune can help maximize the performance (not a lot from a CAI, but the point is the same). The benefits of a tune, for HP, go up with more mods.
However, everything in our cars is controlled by the ECM, TCM, BCM, etc. That's Engine, Transmission, and Body Control Modules. If you have an auto, you can tune shift points, shift pressures, rpm limits, and even create entire profiles to correspond with different shit modes (normal, sport, manual, etc.).
Also, you can tune a lot of other things on the car. With the Camaro, I'm sure that, at some point, you'll be able to hack into the suspension settings and other stuff.
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