Here we have the M-90 ECM currently being used on the dyno. Notice its compact, rugged design. Also contained within the unit are rubber mountings to aid in shock absorption. In case you're wondering, the "M" stands for Mast and the "90" for its 90-pin connection. The M-90 has many capabilities including: Drive by Wire, Variable Valve Timing, Wideband Knock control, Wide Band O2 capabilities, Octane Learn for changes in fuel conditions, and corrected fuel pressure tables. The M-90 can also be configured with or without ignition drivers depending on its given application. The M-90 also contains Throttle Position Governing. This feature allows for two-step activation with a smooth rev limit applied, which means no more banging and popping off the rev-limiter for the drag crowd.