In 1999 Saab introduced the new 9-3. It was designed to put a new face on the 20 year old 900 model. The 1998 900 and the 1999 Saab 9-3 have a lot in common. Many of the aftermarket parts that worked on the 900 also work on the 1999 9-3. This includes the aftermarket dump valve that gives turbo changed cars their signature "whoosh" sound. But in 2000 GM acquired a majority share in SAAB and made the decision to add Saabs Trionic7 engine management systems and recirculating dump valves into all 9-3 models. This made any Saab made after 2000 and aftermarket dump valves incompatible.
Set the hand break. Remove the key from the ignition switch and open the bonnet.
Disconnect the negative battery lead from the battery terminal using the adjustable wrench. Usually this lead is black. This will prevent any possibility of shock or shorting during the project.
Clean the area where you will be working with the clean towel. Wipe dust from the air intake and bypass valve located between the radiator and engine block.
Locate the factory bypass valve. The bypass valve is positioned to the right of the engine block and to the left of the battery. It is connected to the silver pipe in between the engine and battery called the inlet pipe and the black plastic air intake pipe that runs parallel to the radiator. It also has a 1/4 inch vacuum hose attached to the front.
Loosen the four circular clamps that hold the bypass valve in place using the flat head screwdriver.
Slide the bypass valve out of the two rubber tubes attached to the inlet pipe and air intake. Remove the two round clamps from bottom rubber tube.
Disconnect the 1/4 inch vacuum hose by pulling it off the nipple on the bypass valve.
Slide the aftermarket dump valve in to the rubber tube connected to the inlet pipe. Tighten the two circular clamps to hold the dump valve in place.
Slide the air intake plug into the rubber tube or slide the film canister over the rubber tube. Use the two circular claps removed in section two step three to clamp the plug or canister in place. Tighten the clamps until an air tight seal is created.
Reconnect the 1/4 inch vacuum hose to the small nipple on the aftermarket dump valve.
Reconnect the negative battery lead and close the bonnet.
Aftermarket dump valves can only be fitted to the 1999 Saab 9-3 all other models require a recirculation valve.
Aftermarket modification usually voids any existing warranties.