Quote:
Originally Posted by whiskeyfed
Also, the plastic and circuit board may cost $10, but they are selling their "performance chip." HP Tuners charges $300 for their MPVI2 with no credits. The plastic probably costs $15, but you get access to your car's ECU and almost endless additional accessibility. No one complains about them...
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A piggyback doesn't use a "Chip", it uses different level resistors to fool the chosen sensor into false readings. The more or less resistance, the higher or lower values the ECU sees. It's very limited and with todays ECU's it's dangerous as the ECU will see another abnormally such as a high intake temp that doesn't match the false boost and fuel input and will adjust timing. Will it work for low boost levels? Probably. Is it the best option for the money? Not at all.