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Yes its just a sensor and a tune. You need to run 91+ octane to be "safe". the benefit of the tune is that it allows for other hp increasing mods. The stock tune, with say a cai or exhaust, will supposedly start pulling power after a short period of time, close to stock levels. So any mods then would eventually become pointless. The stage 2 tune does not revert back and will allow sustained power gains from other bolt-ons. I had an '08 saturn sky redline. Stock it wasn't bad. But i did the gm tune, larger intercooler, hard ic piping, and catback exhaust. Car was so much more fun.
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