C7 Corvette Grand Sport CORSA Xtreme NPP Axle-Back Exhaust 14777 (2017–2019 Manual)
The CORSA Xtreme 14777 is a valved axle-back exhaust system engineered specifically for 2017–2019 C7 Corvette Grand Sport models equipped with factory NPP and a manual transmission. It delivers CORSA’s most aggressive exhaust sound when valves are open, while retaining quieter cruising capability when closed—without interior drone.
Product Overview
- CORSA Part Number: 14777
- System Type: Axle-back exhaust
- Sound Level: CORSA Xtreme
- Valves: Retains factory NPP valves
- Tips: Quad 4.5" Polished Pro-Series
- Material: 304 stainless steel
- Made in: USA
Why CORSA Xtreme with NPP
This system combines CORSA’s patented Reflective Sound Cancellation® (RSC®) technology with factory NPP valve control. In Tour mode, exhaust volume is reduced for comfortable cruising. In Sport or Track mode, the valves open to unleash a sharp, race-inspired exhaust note—without the low-frequency drone common in other systems.
Key Benefits
- Dual-mode sound control: Quiet cruising or aggressive performance
- Xtreme volume: CORSA’s loudest exhaust profile when valves are open
- No drone cruising: RSC® technology targets cabin resonance
- Factory integration: Works seamlessly with OEM NPP operation
- Premium finish: Quad polished Pro-Series exhaust tips
Performance & Construction
- Straight-through axle-back design for improved exhaust flow
- Precision TIG-welded 304 stainless steel construction
- Weight savings compared to factory exhaust components
- Lifetime warranty on exhaust system (5 years on valves)
Installation Overview
- Install Type: Direct bolt-on axle-back
- Cutting/Welding: Not required
- Estimated Install Time: 1–2 hours
- Note: Professional installation recommended for valve alignment
Corvette Compatibility
- Fits: C7 Corvette Grand Sport (2017–2019)
- Transmission: Manual only
- Required: Factory NPP-equipped vehicles
- Will NOT Fit: Automatic Grand Sport or non-NPP models
What Corvette Owners Say
“Perfect balance—quiet on the highway and absolutely aggressive in Track mode. Exactly what my manual Grand Sport needed.”
Since 2007, Custom Corvette Accessories has helped Corvette owners choose the correct exhaust the first time—without fitment surprises.
Upgrade your manual Grand Sport with CORSA Xtreme 14777 and enjoy true valved performance.
Vehicle Fitment & Specifications
| Generation: | C7 |
| Model Years: | 2017 - 2019 |
| Trim Level: | Grand Sport |
| Engine Code: | LT1 |
| Transmission Type: | Manual, Automatic |
| Intended Use: | Street |
Installation Instructions
Download PDF Installation InstructionsShipping Information
| Item Weight: | 61.1 lbs |
| Boxed Weight: | 66.4 lbs |
| Box Size: | 56.6 x 20.8 x 13.8 |