rubicon33- I noticed a slightly better throttle response after installing the hypertech tuner, I left the upgrade at running 87 octane. I changed the shift points so it seems like it has more pep in its steep cause of the later shifts. I also have the corsa sport exhaust and now just recently a volant cold air box. Gas milage in the city stayed the same, but for the free way I increased about 1 1/2 mpg.
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