The IAG Performance 2015 - 19 WRX lower intake risers completely replace the OEM tumbler generator valves as well as the separate lower plastic risers on your turbocharged Subaru FA20 DIT engine. IAG's WRX lower intake risers are designed to improve flow and performance by eliminating the diverter in the OE lower risers. The risers are CNC machined from billet aluminum and do not require porting modifications, cores, or damage to your original OEM parts in case you ever need to return the vehicle to stock. The risers are simple to install requiring only basic hand tools and roughly 1-2 hours of time.
*ECU calibration is required. Possible engine damage may occur without calibrating the ECU after installation.