Make a 1997 Saab 900SE Turbo Faster

The Saab 900SE has a 2.0-liter, turbo-charged engine. From the factory, the 900SE produces 185 horsepower. Saab designed the 900SE with the layman in mind. Its Trionic 5 ECU, which governs the 900's engine system, is designed to accommodate low-grade gasoline and oil. With a few simple tools and the right knowledge, a driving enthusiast can unlock as much as 35 horsepower without replacing any of the car's factory hardware by simply installing a reprogrammed ECU.Preparation
1. Set the emergency hand brake, remove the key from the ignition switch and open the hood.
2. Disconnect the negative (black) battery lead from the battery terminal with an adjustable wrench to prevent any possibility of shock.
3. Open the passenger's side door and remove the floor mat.
Locating and Removing the Factory ECU
1. Loosen and remove the lower dashboard screw with a 10 mm socket wrench. The screw is located by the door frame where the carpet meets the dashboard, across from the door speaker.
2. Pull back the carpet to access ECU, being careful to avoid creasing the carpet.
3. Loosen the screw holding the ECU in place with the 10 mm socket wrench. The ECU is a rectangular silver box with a black and red lever on the bottom and is mounted under the dashboard.
4. Move down the black part of the lever to release the wire coupling then disconnect it.
5. Slide out the factory ECU.
Installing the New ECU
1. Slide the aftermarket ECU into its slot.
2. Line up the wiring coupler and plug it into the new ECU. Release the handle into its closed position.
3. Replace the 10 mm screw that holds the ECU in the bracket. Replace the carpeting then reinstall the lower dashboard screw.
4. Reconnect the battery lead with the adjustable wrench then close the hood.
5. Start the car and take it for a test drive, running it at low speeds first then progressively working up to higher speeds.