Our popular GT series exhaust for the E60 535i offers an aggressive sound and exceptional performance at a great price. This is a full catback system and has a nice deep tone to enhance the sound of the N54. This exhaust is 100% bolt on with no other parts/hardware to purchase. Expect a 5-10whp gain with the installation of our full system. The E60 535i GT system is constructed from T-304 stainless steel and is tig welded to our highest standards. All RPi exhausts are RPi dyno tested and come with a limited life time warranty.