This special order Autothority chip is used when swapping the 325i engine into the 325e chassis. Fits 325e models with ECU part# "--027" with 24 pin E prom. Eliminates the need to swap over expensive computers or wiring harness! The chip is a performance chip, so you get the horsepower increase of a performance chip, plus the e to i change over requirements all in one package! This chip is brand new and retails for $450. I'm selling it because I've modified my engine and I'm having a custom chip dyno tuned $$$ for the car.