AVO S1B04G69I001J Electronics Throttle Controller - Legacy/Outback (02-06 WRX/STI/FXT / 05-06) AVO designed this turbocharger kit specifically for the Mazda ND AVO includes all the necessary supporting components The reduced back pressure of the AVO exhaust system as a whole gets rid of the terrible dip in the torque curve, and the improved flow increases performance