C7 Corvette Z06 Borla ATAK 11903 with NPP Exhaust (2015-2019)

Borla ATAK Axle-Back Exhaust for C7 Corvette Z06 with NPP (11903)

If you want the most aggressive Borla sound for a C7 Corvette Z06 while keeping the factory NPP valved exhaust functionality, the Borla ATAK 11903 is the go-to axle-back. It’s built around 2.75-inch tubing and finishes with a quad center-exit look using 4.25-inch polished “intercooled” tips for a clean, high-end rear appearance.

Borla 11903 Product Details

• System type: Axle-Back (valved)
• Sound level: ATAK (maximum volume, sharp and aggressive)
• Fitment focus: C7 Z06 equipped with factory NPP valves
• Engine: LT4 (Z06)
• Pipe diameter: 2.75-inch
• Exit: Quad center rear exit
• Tips: Quad 4.25" round rolled, angle-cut polished “intercooled” T-304 stainless tips
• Valves: Retains NPP valves (not an AFM-valve system)
• Material: T-304 stainless steel
• Install: Bolt-on using factory-style valve connections (professional install recommended)
• Warranty: Borla Million-Mile Warranty (valves have a 1-year warranty)

Why Z06 Owners Choose the Borla ATAK 11903

• Maximum presence: ATAK is the loudest Borla sound option for this application
• Valved control retained: keeps the factory-style NPP behavior and modes
• Premium construction: T-304 stainless with a fitment-first design
• Rear styling upgrade: quad polished tips fill the opening with an aggressive, OEM+ look

What to Expect After Installation

• More bite at throttle: sharper, more immediate sound character under load
• Stronger personality overall: a noticeable change from stock even in normal street driving
• Valve-equipped street manners: keeps the car’s valved setup for day-to-day flexibility

Corvette Compatibility

• Fits 2015–2019 Chevrolet Corvette C7 Z06 (LT4) with NPP valves (Automatic or Manual).
• Also listed to fit 2017–2019 C7 Grand Sport (LT1) with NPP on Manual transmission only.
• Drive: RWD.

What Corvette Owners Say

“ATAK is exactly what I wanted—way more presence, and the valved behavior still feels factory.”

If you want the loudest Borla axle-back that keeps your Z06’s NPP valves and finishes with polished quad tips, the Borla ATAK 11903 is the right move.