Borla ATAK Axle-Back Exhaust System (11903CB) - 2015-2019 Chevrolet Corvette C7 Z06 & Grand Sport (With NPP / Without AFM)
Unleash the loudest, most aggressive, race-inspired soundtrack available for your track-ready supercar with the Borla ATAK Axle-Back Exhaust System. Custom-engineered specifically for 2015 to 2019 Chevrolet Corvette C7 Z06 platforms and 2017 to 2019 Grand Sport models without chassis-level Active Fuel Management (AFM) valves, this premium aftermarket upgrade delivers an uncompromising roar while keeping full compatibility with your factory multi-mode exhaust. ATAK (Acoustically-Tuned Applied Kinetics) technology relies on vehicle-specific internal muffler cores that are precisely calibrated to focus sound waves into a high-definition, earth-shaking V8 growl under heavy throttle. While the exterior volume remains fiercely intense, Borla's painstaking engineering ensures the interior cabin remains devoid of harsh resonance or drone during highway cruising. Constructed with a high-flow 2.75-inch pipe diameter, this free-flowing layout optimizes exhaust gas velocity and scavenging to unlock hidden horsepower and sharpen throttle response on high-output engines.
What sets the Borla 11903CB apart is its selective integration of integrated exhaust valves combined with a stealthy aesthetic. This system does NOT contain AFM valves but comes fully equipped with premium mechanical NPP dual-mode valve assemblies. These internal assemblies seamlessly accept your factory electronic valve actuators, allowing full retention of the Corvette's drive-mode steering wheel or dash-controlled sound profile adjustments. Fabricated entirely from premium, aircraft-grade T-304 austenitic stainless steel, this setup is vastly superior to budget aftermarket alternatives or factory T-400 series alloys (such as 409) to provide permanent protection against deep rust, moisture corrosion, and structural cracking. Precision computer numerical control (CNC) manufacturing and ultra-smooth mandrel bends ensure a direct, line-to-line bolt-on slip fitment. The center-exit rear section is finished with a stunning set of quad 4.25-inch round, rolled angle-cut intercooled ceramic black coated T-304 stainless steel tips for a stealth appearance. For a complete exhaust overhaul, this axle-back can be paired with Borla's optional mid-section X-Pipe (Part #60548) to create a full Cat-Back system.
Features
- Patented ATAK (Acoustically-Tuned Applied Kinetics) technology delivers Borla's loudest, highest-definition sound
- Projects an uncompromising exterior roar under acceleration while keeping the cabin free of harsh drone
- Features integrated mechanical NPP exhaust valves to fully retain factory drive-mode sound adjustments
- Built without AFM valves for specialized performance platforms that omit active cylinder-deactivation hardware
- Constructed completely from heavy-duty, premium T-304 austenitic stainless steel for permanent durability
- Ultra-smooth 2.75-inch CNC mandrel bent tubing eliminates internal bottlenecks to maintain maximum exhaust velocity
- Finished with premium center-exit quad 4.25-inch round, rolled angle-cut intercooled ceramic black coated T-304 stainless steel tips
- Can be combined with Borla X-Pipe (Part #60548) to convert the assembly into a full Cat-Back system
- Direct, precision-engineered bolt-on installation with a line-to-line slip fitment
- Backed by Borla's Million-Mile Warranty on non-moving parts (exhaust valves carry a 1-year warranty)
Fitment By Year, Make & Model
2019 Chevrolet Corvette
- 2019 Chevrolet Corvette Z06 6.2L Supercharged LT4 V8 (Coupe / Convertible, RWD, Automatic or Manual Transmission, with NPP valves, WITHOUT AFM)
- 2019 Chevrolet Corvette Grand Sport 6.2L LT1 V8 (Coupe / Convertible, RWD, MANUAL TRANSMISSION ONLY, with NPP valves, WITHOUT AFM)
2018 Chevrolet Corvette
- 2018 Chevrolet Corvette Z06 6.2L Supercharged LT4 V8 (Coupe / Convertible, RWD, Automatic or Manual Transmission, with NPP valves, WITHOUT AFM)
- 2018 Chevrolet Corvette Grand Sport 6.2L LT1 V8 (Coupe / Convertible, RWD, MANUAL TRANSMISSION ONLY, with NPP valves, WITHOUT AFM)
2017 Chevrolet Corvette
- 2017 Chevrolet Corvette Z06 6.2L Supercharged LT4 V8 (Coupe / Convertible, RWD, Automatic or Manual Transmission, with NPP valves, WITHOUT AFM)
- 2017 Chevrolet Corvette Grand Sport 6.2L LT1 V8 (Coupe / Convertible, RWD, MANUAL TRANSMISSION ONLY, with NPP valves, WITHOUT AFM)
2016 Chevrolet Corvette
- 2016 Chevrolet Corvette Z06 6.2L Supercharged LT4 V8 (Coupe / Convertible, RWD, Automatic or Manual Transmission, with NPP valves, WITHOUT AFM)
2015 Chevrolet Corvette
- 2015 Chevrolet Corvette Z06 6.2L Supercharged LT4 V8 (Coupe / Convertible, RWD, Automatic or Manual Transmission, with NPP valves, WITHOUT AFM)
Important Application & Valve Notes:
- **Grand Sport Transmission Fitment:** Fits 2017-2019 Grand Sport models equipped with a **Manual Transmission ONLY**. Does NOT fit automatic Grand Sport models due to differing rear structural clearancing.
- Fits **6.2L V8 engines** (LT4 Supercharged for Z06 / LT1 Naturally Aspirated for Grand Sport). Does not fit base Stingray models.
- **Valve Requirements:** Intended strictly for vehicles equipped from the factory with **NPP Dual-Mode performance exhaust** but **WITHOUT AFM cylinder-deactivation valves** in the exhaust section.
- **Warranty Note:** Borla's Million-Mile Warranty covers all non-moving stainless steel components. The moving exhaust valve mechanisms are warrantied separately for 1 year. Failures of the original GM factory electronic actuators themselves are not covered.
CA Residents: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov
