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Don't waste your money. All it does is alter the intake air flow sensor temperature reading to the ECM to try to trick the car in changing the fueling. It's a completely wrong way to go about trying to tune a car.
Pretty much. You can look at this in one of two ways - either the company knows that it's a lie (see above post) but still sells it anyway which makes it a scam. OR, they don't know that it doesn't work on Corvettes in which case why would I want to install something on my motor from a company that doesn't know what they're doing? Take your pick.
DO NOT BUY THAT G-FORCE GARBAGE! It is literally a module or "chip" that splices into the IAT sensor wiring. It is NOT a new ECM calibration or "tune".
If you want a little more power, get a good dyno tune or mail order tune from a reputable shop. On a stock LS3, I don't think you'll get much more than ~15 rwhp, but I could be wrong on that.