Borla ATAK Axle-Back Exhaust for C7 Corvette Grand Sport Manual with NPP (11905)
Borla ATAK 11905 is built for the 2017–2019 C7 Corvette Grand Sport with NPP dual-mode valves—and it’s manual transmission only on the Grand Sport. If you want the loudest, sharpest sound family in Borla’s lineup while keeping the factory-style valve behavior, this axle-back is the fitment-first move for an aggressive street personality and a quad center-exit finish.
Borla 11905 Product Details
- System type: Axle-Back
- Sound level: ATAK (maximum aggressive sound)
- Fitment focus: 2017–2019 C7 Grand Sport manual transmission ONLY with NPP valves (system is without AFM valves)
- Engine: LT1 (Grand Sport)
- Pipe diameter: 2.75"
- Exit: Quad center rear exit
- Tips: Dual 4.25" round polished T-304 stainless tips on each muffler (quad total), rolled angle-cut
- Construction: T-304 stainless steel with mandrel bends
- Upgrade path: Add Borla X-Pipe 60548 to create a Cat-Back system
- Warranty: Million-Mile Warranty for non-moving parts; exhaust valves covered for 1 year
Why Grand Sport Owners Choose ATAK 11905 (Street Builds)
- A bigger sound change than stock while keeping the NPP valve functionality
- High-energy ATAK tone that stays crisp and sharp when you roll into the throttle
- Quad center-exit polished tips give the rear a cleaner, more finished look
- T-304 stainless construction designed for long-term corrosion resistance
What to Expect After Installation
- Noticeably stronger sound presence under acceleration
- Aggressive ATAK character with a cleaner, higher-intensity note than stock
- Factory-style NPP valve behavior retained through the valved setup
Corvette Compatibility
- Fits 2017–2019 Chevrolet Corvette C7 Grand Sport with NPP dual-mode valves.
- Manual transmission ONLY (Grand Sport).
- Coupe or Convertible, RWD applications.
What Corvette Owners Say
“Exactly what I wanted—more volume and attitude, and the valves still work the way they should.”
Ready to upgrade? Order the Borla ATAK 11905 and give your Grand Sport a louder, sharper exhaust personality while keeping the factory NPP valve functionality.
✅ In-stock items ship within 24–48 hours via Standard Ground.
✅ Free shipping items are available in the Continental US only.
✅ Custom quotes available for 2-Day, Next Day, or Saturday delivery.
✅ Custom or backordered items ship as soon as available.
