An Axle-Back system replaces only the rear section from the axle back, covering the mufflers, rear piping, and tips. A Cat-Back system replaces the full exhaust path from the catalytic converter back, including the mid-pipe, crossover, resonators, muffler, and tips. 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. Both are 50-state street legal and carry the Million Mile Warranty.

Installation method varies by application. Some Axle-Back systems are direct bolt-on. Others require cutting the stock exhaust to allow the Borla system to clamp on. All required hardware and instructions are included in every kit. Confirm the installation method for your specific part number at borla.com.

On platforms with factory active valve systems, Borla offers dedicated Axle-Back SKUs for both Active and non-Active configurations. These are separate part numbers and are not interchangeable. Always confirm active exhaust compatibility when selecting your part number, or use the fitment selector at borla.com.

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®.

Yes. Borla Axle-Back systems are 50-state street legal. The system replaces only the rear mufflers, piping, and tips, leaving all factory emissions hardware completely intact. Your vehicle will pass a visual or functional emissions inspection just as it would with the stock exhaust in place.

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. The warranty is not transferable to subsequent owners. Claims require proof of original purchase and are handled directly through Borla.