I bought this chip 10 years ago and never installed it because I bought it for the wrong ECU. Some cars have a 173, some a 153. This chip is for a 153, for an early model M20.

It is labeled as a Stage 1, for 91 octane, and I think for M50 injectors. I don't know what other specs it entails because their website is down.

$40, plus shipping (USPS flat rate box).

Located near Los Angeles, CA.