This is a used red box high performance APC turbo controller for a Saab 9000. Saab part number 8660334 (86-60-334). This is the Carlsson 2.0 APC controller, and is only for direct ignition vehicles that used the APC system. The other part number for this is 137007407. Unlike the earlier 9000 red boxes this one can't be used in the classic 900 because it's made for just the 9000s with direct ignition.