Description
The Borla ATAK axle-back exhaust system, part number 11903, is designed for C7 Corvettes equipped with the NPP dual-mode exhaust. It includes NPP valves but does not include AFM valves. This rear axle-back kit is sold as a kit and includes two mufflers and installation hardware; catalytic converters are not included.
Built from natural-finish 304 stainless steel, the system uses CNC-manufactured components and ultra-smooth mandrel bends. Borla’s patented straight-through and multi-core technology is intended to support exhaust flow and deliver the distinctive ATAK sound. Borla describes the increased exhaust velocity as helping unleash power and improve fuel economy; actual results can vary.
- Configuration: Dual inlet, four outlet; two turbo-style mufflers, each with a single inlet and dual outlets
- Pipe diameter: 2.75-inch intermediate pipes and tailpipes
- Tips: Four polished 304 stainless steel tips, 4.25-inch outlets, round with slanted intercooled cuts and rolled edges
- Finish: Natural stainless steel on the system and mufflers
- Condition: New, not remanufactured
Confirm that your Corvette has the NPP dual-mode exhaust before ordering. This system is not described as including AFM valves. Verify vehicle fitment and applicable requirements before installation.
Emissions notice: It is illegal to install parts or components that bypass, defeat, or render inoperative manufacturer technology or design required to reduce vehicle emissions under state and federal Clean Air Act standards.
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.
