Description
The Borla ATAK Axle-Back Exhaust System (part number 11921CFBA) replaces the factory mufflers and exhaust pipes behind the rear axle. This dual-in/four-out system follows the original exhaust path and uses the factory hangers and rubber isolators. It is designed for models equipped with NPP Dual Mode Exhaust.
ATAK—Acoustically Tuned Applied Kinetics—is Borla’s highest-decibel street-legal exhaust lineup, intended for drivers who want an especially prominent exhaust note. Its tuned internal muffler cores are designed to shape and focus sound at higher volume.
- Construction: 304 stainless steel system and mufflers, with a natural finish
- Layout: Rear axle-back; dual in/four out; split rear exit
- Pipes: 2.75-inch intermediate pipes and 2.50-inch tailpipes
- Mufflers: Two turbo-style mufflers, each with a single inlet and dual outlets
- Tips: Four included, 4.00-inch round carbon-fiber tips with slant cuts and non-rolled, single-wall edges
- Included: Installation hardware; sold as a kit
The system does not include catalytic converters and is not remanufactured. Installation time depends on the vehicle’s exhaust layout: vehicles with a factory service point behind the axle may allow installation without cutting, while some vehicles require cutting. Hardware and instructions are included.
Important: It is illegal to install parts that bypass, defeat, or disable manufacturer technology designed to meet state and federal Clean Air Act emissions standards. Verify that this system suits your vehicle and intended use before ordering.
Fitment and ordering notes
- Confirm the exact model, part number, configuration, dimensions, and application against the information shown in this listing.
- Review the product images and listed attributes before ordering; fitment can vary by vehicle, equipment, year, and installation setup.
- Contact X Factor Motorsport for availability, fitment, product questions, or freight guidance before purchase.
