The cheaper chip upgrades (cheap being a relative term) allow you to modify a stock motor to run a more aggressive set-up for more power. [B]BUT[B/] if you install a cam or run bigger heads, or even bolt on headers with free flowing exhaust, it doesn't know what to do with the input information it receives because it is off the "cheap" chip upgrades map. You get what you pay for. If you are staying stock and anticipate no changes then they will work for you. If you are unhappy with the out put of your LT1 and dream of LT-4 power on nitrous, then the cheap chip will not cut it. You need a lap top with software to reprogram the chip at will.