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I dont know alot about the computer in the LT1 or anything but Im thinkin' you get what you pay for. Five dollars doesnt go a long way these days. Youd be better off putting that money into something tried and true. The Best V8 Stories One Small Block at Time
What these chips do is provide false data to the ecu to try to get it to increase timing, change the fuel mixture, etc. Not only will this likely not gain you anything, it could cause things to not run correctly.
You can gain power by changing the tune, but you need to do it properly (mail order or custom tune that actually changes the program), not just altering the input parameters.



