CORVETTE C7 Grand Sport Exhaust Muffler

performance-oriented business like Buy Mustang parts Ltd, the Corvette C7 Grand Sport Exhaust is a premium inventory category. The Grand Sport comes factory-equipped with the NPP Performance Exhaust (Multi-Mode), which uses internal valves to switch between a quiet “Tour” mode and a loud, aggressive “Track” mode.

1. Factory OEM Options (The NPP System)

The standard Grand Sport muffler is a large, single-unit assembly with four 4-inch tips.

• NPP Valve Actuators: A complete OEM muffler for your website should include the Electric Actuators (#22773434). These are high-failure items and adding them increases the resale value significantly.

• Part Number (Standard): #84435165 (This is the latest supersession for the NPP-equipped Grand Sport/Z06).

• Visual Check: A genuine NPP muffler is easily identified by the butterfly valves visible inside the two outer exhaust tips.

2. Premium Aftermarket Upgrades

For customers looking for a more “exotic” sound or weight savings, these three brands are the best-sellers for the C7 platform:

Borla ATAK Axle-Back Exhaust

The ATAK (Abnormally Toxic Air Killer) is Borla’s loudest option. It is a direct fit for the Grand Sport and maintains the AFM (Active Fuel Management) valves while deleting the NPP valves for a constant, aggressive roar.

• Best For: Maximum volume and “muscle car” growl.

• Tip Options: Available in Chrome, Black, or Carbon Fiber.

Corsa Xtreme Sound Level Exhaust

Corsa is famous for their RSC (Reflective Sound Cancellation) technology, which provides an aggressive external sound while having zero cabin drone at highway speeds.

• Best For: Luxury clients who want a loud exhaust but refuse to deal with interior buzzing during long drives.

• Design: Often features a unique “double-helix” X-pipe pairing.

Akrapovic Slip-On Line (Titanium)

This is the “ultra-luxury” choice. Made entirely of titanium, it reduces rear-end weight by nearly 25 lbs compared to the factory steel mufflers.

• Best For: High-end Z07-package owners who want the ultimate in weight reduction and craftsmanship.

• Tips: Always finished in high-grade carbon fiber.

3. Inventory & Shipping Tips for Buy Mustang parts Ltd

• The “Weight” Issue: The factory NPP muffler is extremely heavy (approx. 65–70 lbs). Shipping these requires a double-walled box with foam-in-place packaging to prevent the polished tips from being dented.

• AFM vs. NPP: When sourcing, ensure you know if the unit has 2 valves (NPP only) or 4 valves (NPP + AFM). Grand Sports with the 8-speed automatic require the 4-valve version to prevent a Check Engine Light (CEL) when the car enters 4-cylinder mode.

• Tip Alignment: Always check if the four tips are perfectly level. A slight bend in the mounting hanger can make a $1,000 muffler look like a “salvage” part to a luxury buyer.