HKS manufactures various aftermarket blow-off valve kits that bolt easily onto your turbo system's aftermarket intercooler piping. The HKS blow-off valve will reliably operate under higher turbo boost pressure than stock blow-off valve units, increasing the peak horsepower potential of your turbo system. HKS blow-off valves also make a customized air-release noise when the turbocharged air is vented during throttle lift. If you are installing the HKS blow-off valve onto stock intercooler piping in place of a recirculated blow-off valve unit, refer to a vehicle-specific installation diagram, as minor customizations to the piping and/or vacuum system may be necessary.
Remove the stock blow-off valve from the upper intercooler pipe, located midway between the throttle body and intercooler outlet. Generally, blow-off valves are secured to the intercooler pipe flange by two hex bolts or Phillips screws. Remove these, and disconnect the turbo vacuum line fitting from the blow-off valve vacuum connection. The blow-off valve unit will then lift free.
Fit the HKS blow-off valve onto the intercooler pipe blow-off valve flange. Some vehicles may require placing a blow-off valve flange adapter between the blow-off valve and intercooler pipe for proper connection to the flange. Install the supplied blow-off valve gaskets between the blow-off valve and the mounting flange, then secure the blow-off valve by reinstalling the stock bolts or screws. Ensure the blow-off valve is securely connected to the flange to avoid boost pressure leaks.
Fit the turbo vacuum line onto the HKS blow-off valve vacuum fitting, located on the rear of the blow-off valve. The vacuum line will simply slip over the blow-off valve vacuum nipple. On vehicles requiring a modified vacuum line, HKS blow-off valve kits include a replacement vacuum line and/or T-fitment for connection to the vacuum line system.
