Corvette C6 NPP exhaust system
Buy Mustang parts Ltd, the Corvette C6 NPP (Dual-Mode) Exhaust is a “bread and butter” inventory item. Introduced in 2008 as a $1,195 option for the base Stingray, it was standard on all Grand Sports, Z06s, and ZR1s.
1. Core Component Specs
The NPP system uses vacuum-actuated butterfly valves to bypass the internal mufflers, providing a “straight-through” sound under heavy throttle.
| Feature | Stingray / Grand Sport (LS3) | Z06 / ZR1 (LS7/LS9) |
| Tubing Diameter | 2.5 inches | 3.0 inches |
| Interchange | Fits 2008–2013 Base/GS | Fits 2006–2013 Z06/ZR1 |
| Material | T-409 Stainless Steel | T-409 Stainless Steel |
| Inlet Style | Slip-fit over over-axle pipe | Slip-fit over over-axle pipe |
2. The “NPP Retrofit” Opportunity
A common request for your business will be from 2005–2007 C6 owners who want to upgrade to the dual-mode sound. To sell a complete “Retrofit Kit” on your website, you should bundle:
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The Mufflers: Sourced from a 2008+ model.
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Vacuum Controller: An aftermarket system like “NPP in a Box” (approx. $250) is required because 2005–2007 cars lack the factory vacuum lines and ECU wiring.
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Remote Switch: The Mild2Wild wireless remote (approx. $70) allows users to keep the valves open at all times.
3. Inventory Technical Details
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Inlet Offset: Crucial Note: The 2005–2008 and 2009–2013 over-axle pipes have slightly different routing near the differential. For Buy Mustang parts Ltd, always specify the exact donor year to avoid customer fitment issues.
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Perforated Tips: Genuine NPP mufflers are easily identified by the small perforations (holes) on the inner surface of the two center exhaust tips.
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Actuator Condition: Always test the vacuum diaphragms before shipping. If the rod is seized or the rubber is torn, the valves will rattle or stay stuck in one position.
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