RPI GT axle back system for the 545i is unique and unlike any other exhausts system for the 545i. With maximum velocity in mind, this 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
RPI exhaust systems are designed in house and offer an excellent balance of performance and sound. All RPi exhaust systems are tested under strict conditions to ensure the most performance for your car. For those who want better sound and performance without drawing a lot of attention, we have the ST series. The GT and GtRace series exhaust systems are designed for maximum sound and power. All RPi exhaust systems are made in the USA using top quality T304 stainless steel and come with a Limited Life Time Warranty.