Take a deep breath, we know you are excited. Borla's unequal length header is here to unleash the Boxer rumble that your stock system does not produce. You can expect an increase in low end torque and throttle response throughout the RPM range. Every header is constructed from T-304 stainless steel to give you the best in performance and durability. The header is designed without the restrictive primary catalytic converter and the incorporated proven flex-coupler design combats the vibration of the Boxer engine for increased longevity. Borla products are backed by a million-mile warranty, so this is the only header you will ever have to buy for your FR-S.