Our GT axle back system for the 545i is unique and unlike any other exhaust system for the 545i. With maximum velocity in mind, our GT system uses a reduction method to maintain exhaust gas temperatures towards the rear of the exhaust system. This allows for significant HP and TQ gains throughout the entire power band during the dyno tests.

Like all RPi exhaust systems, each comes with a limited lifetime warranty and is 100% made in the United States.