Every number on this sheet was measured against the OEM body and published.
OEM equal-length headers killed the Subaru rumble for a reason: equal-length runners are theoretically more efficient. Theory met reality and the WRX faithful pushed back. Our unequal-length tune brings the burble back without losing the power band.
Every order ships with hardware, instructions, and a link to the AFD installation video.
Watch the install video →Every part QC-checked and serial-tagged before it ships. Verify fitment against the OEM body before drilling anything.
Tape the part in place, walk around the car, eyeball the panel gap. Adjust before committing the adhesive.
Torque to spec sheet, peel the VHB liner, press for 30 seconds per zone.