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The horsepower that G-Tech measures also includes vehicle aerodynamic drag. This means that if you tape over your headlights and grill, remove rear view mirrors and windshield wipers to reduce your drag, you will measure a Horsepower increase even though you didn't make any changes to the engine. After adding an aftermarket spoiler you will likely find a decrease in measured horsepower, since you increased the drag losses on your vehicle.
Leave the Gtech to the ricers and idiots of the world...they deserve each other.

Dyno for horsepower, track for speed. Anything else is unreliable.
 

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I've used the older one and it was pretty accurate. I later sold it since it was become harder and harder for me to actually do some testing in my area of town. Never got a chance to run it heads up at the track to see how they compared. If I had some spare "toy" money I wouldn't mind picking up the newer one.
 
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