NPP is the product option code for Chevy's Dual Mode (Bi-Model) exhaust upgrade that opens and closes a valve to control exhaust sound.
CORSA's NPP valve assemblies bolt directly to stock actuator motors. Choose this option if you need quiet start, C8 is heavily modified, or want to be stealthy.
ALL SYSTEMS
• 3.0” 304 Stainless Steel Construction
• Custom X-Pipe Design
• Twin 4.5” Tips (Slash Cut Pro-Series or Flat Cut Carbon Fiber)
• No CEL
• Straight-through Design
• Mandrel Bent
• Lifetime Warranty / 5 Years Valves
• All Hardware and Detailed Instructions Included
• Proudly Manufactured in Berea, Ohio
WHAT ARE AFM VALVES?
Active Fuel Management (AFM) improves gas mileage by deactivating engine cylinders. This causes a resonance which can be unpleasant.
Choose this option if you want to maintain a comfortable cabin sound or are sensitive to 4Mode frequencies.