Racing Parts

Ecu Piggyback

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AE86 MR2 HKS F CON 4AGZE 4AGE Piggyback ECU $350.00 Time Remaining: 21d 23h 14m Buy It Now for only: $350.00

Ecu Piggyback

what is a "PIGGYBACK ECU" ? ( Subaru STI )?

What is the difference between Piggyback ecu and the standard ECUs?

A piggyback ECU is just a computer that sits in between usually the airflow meter and the stock ECU, which intercepts the signal from the airflow meter and changes it so the stock ECU injects the correct amount of fuel. This is essentially a crude band-aid fix for tuning a modified car, and I wouldn't do it to an STi. Save up the money and do it right, by getting the stock ECU re-flashed by a reputable tuner, such as Vishnu, Cobb, XS Engineering, etc.

RRM Kizashi Piggy Back Ecu Driving Impressions