A Cat-Back system replaces the full exhaust path from the catalytic converter back, including the mid-pipe, crossover, resonators, muffler, and tips. An Axle-Back system replaces only the rear section from the axle back, covering the mufflers and tips. Installation method varies by application. Some systems are direct bolt-on, while others require cutting the stock exhaust to allow the Borla system to clamp on. All required hardware and instructions are included. Both are 50-state street legal and carry the Million Mile Warranty. The Cat-Back delivers a more comprehensive sound and flow upgrade because it addresses more of the undercar exhaust path. The Axle-Back is a more affordable solution that delivers a distinct Borla sound note with aggressive punch. While it does not provide the same full-bodied sound as a Cat-Back, it is available in the same ATAK®, S-Type, and Touring sound levels.

Under the Magnuson-Moss Warranty Act, a manufacturer cannot void your vehicle warranty solely because you installed an aftermarket part. They must demonstrate that the aftermarket part caused the specific failure in question. A properly installed Borla Cat-Back system does not modify any emissions hardware and should not affect powertrain warranty coverage. Installation method varies by application. Some systems are direct bolt-on, while others require cutting the stock exhaust to allow the Borla system to clamp on. All required hardware and instructions are included. Confirm with your dealer before installation if coverage is a concern.

Drone is the phenomenon of exhaust resonance matching cabin frequencies at highway cruise RPM, typically between 1,500 and 2,200 RPM, creating an uncomfortable sustained note inside the vehicle. Borla's engineering process includes extensive drive-cycle testing on each platform to identify and eliminate these frequencies through muffler core configuration and flow-path geometry. No Drone technology applies to all three sound levels, including ATAK®. Even the loudest Borla system remains comfortable on a long-distance drive.

Yes. Borla Cat-Back systems are emissions-legal for street use in all 50 states, including California. Because the system begins downstream of the factory catalytic converter, all emissions control hardware remains completely untouched. Your vehicle will pass a visual or functional emissions inspection just as it would with the stock exhaust in place.

Yes, with the correct part number. On vehicles with factory active valve systems, such as Chevrolet's NPP on the C8 Corvette, Borla offers Cat-Back systems that retain the OE valve actuators for full exhaust volume control. These require valve actuator recalibration after installation on platforms such as the C8. Bypassing the valves without addressing the actuator wiring will trigger a dashboard warning light. Always confirm active exhaust compatibility when selecting your part number, or use the fitment selector at borla.com.

Borla's Million Mile Warranty covers defects in materials and workmanship for the original purchaser for the life of the vehicle, provided it does not exceed one million miles. It does not cover physical damage from road hazards, improper installation, or use on vehicles operating at power levels so far above factory specification that the exhaust is subjected to forces outside its design range. Claims require proof of original purchase and are handled directly through Borla.