Borla 140839BC Cat-Back Exhaust for the 2027 C8 Corvette Grand Sport, Black Chrome Tips
The Borla ATAK 140839BC is a cat-back exhaust for the 2027 C8 Corvette Grand Sport and its 6.7L LS6 V8, finished with four inch black chrome on T-304 stainless steel tips in a dual split rear exit, and built at Borla's aggressive sound level. Nothing about the rear of the car is left the way it arrived. For an owner who was going to change the tips anyway, doing it in the same part number saves buying a tip kit twice.
Black chrome sits over T-304 stainless, so the finish is on the same steel the rest of the system is built from and it is not paint on a plated tip. Behind those tips the 140839BC replaces the exhaust from the catalytic converters back, moving the gas out through 3-inch piping in place of the factory routing, which is a longer run of the car than an axle-back reaches. Committing to the aggressive setting does not cost you the mornings you need the car quiet, because AFM/DFM valves and NPP valves included in the kit connect to the factory actuators. The heat shielding ships with it, so the system arrives complete.
Borla 140839BC Product Details
- Brand: Borla
- Part number: 140839BC
- System type: Cat-Back
- Sound level: ATAK, Borla's aggressive setting
- Fits: C8 Corvette Grand Sport, 6.7L LS6
- Tips: Four inch round, black chrome on T-304 stainless steel, dual round rolled angle cut
- Exit style: Dual split rear exit
- Main piping: 3-inch, with 2-inch and 2.75-inch sections
- Material: T-304 stainless steel construction
- Valves: AFM/DFM valves and NPP valves included
- Shipping: Two boxes
- Warranty: Borla Million Mile Warranty
Benefits
- An aggressive exhaust note on a naturally aspirated 6.7-liter V8
- Cat-back coverage: everything from the catalytic converters back, not only the section behind the axle
- 3-inch main piping in place of the factory routing
- Factory valve behavior kept intact, so aggressive does not mean loud all the time
- Four inch black chrome tips across the wide-body rear, dark where the factory outlets sit bright
- Black chrome is applied over T-304 stainless, not over a painted or plated substrate
What to Expect After Installation
Two things change and both are immediate. Behind the car the tips read dark where the factory outlets read bright, across a fascia wider than any other C8 wears. At throttle the tone is harder-edged than stock, and with the valves closed the car still behaves the way it did the day you picked it up. There is no published decibel figure for this system and we do not estimate one. Owners who have heard the car both ways are the only real source on that, so if the exact sound is what you are deciding on, call us before you order. A warning light after the install is the valve relearn, and the recalibration step is covered below.
Important Exhaust Notes
- This fits the Grand Sport built with the factory NPP valved performance exhaust. Do not install it on a car without O.E. NPP.
- The quad center-exit exhaust is a different car. That layout is the optional RPO WUB and it is standard with the Z52 Track Performance Package. No cat-back is published for it. Check the window sticker before you order.
- Valve actuator recalibration is required after installation, per GM Document ID 5406413, and a Chevrolet dealer is the recommended place to have it done. Book it as part of the install.
CORVETTE COMPATIBILITY
- Generation: C8
- Model: 2027 Chevrolet Corvette Grand Sport
- Model Years: 2027
- Engine: 6.7L LS6 V8
- Body Styles: Coupe and convertible
- Required Equipment: The factory NPP valved performance exhaust with outboard exhaust outlets
Why Buy This Borla ATAK 140839BC From Custom Corvette Accessories?
Custom Corvette Accessories is enthusiast owned and operated, so we confirm the fitment before the order goes out. Send the VIN, or your model year and trim, and we will confirm which factory exhaust your Grand Sport was built with before anything ships, because the outboard NPP outlets and the quad center-exit option are two different cars and only one of them takes this part. Borla 140839BC is the ATAK cat-back in T-304 stainless with four inch black chrome tips and the AFM/DFM and NPP valves included, built for the 2027 C8 Corvette Grand Sport, and Free Shipping in the USA.
✅ In-stock items ship in 1–2 business days 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.
