SPDZ1 AFM & NPP Exhaust Valve Simulators for C8 Corvette (2020-2024)
SHIPPING - RETURNS - WARRANTY - CANCELLATION POLICY
*** Market Conditions after 2020 have changed the landscape of automotive parts. Although we try to stock 1000's of items in our multiple warehouse and use multiple distribution channels, having back-orders are unavoidable in today's market. If you are in need of a product quickly, we suggest email, message, or call us for availability so that we may explore your options.
Email: Sales@Speedzoneweb.com
Call: 407-846-8430
Text: 407-749-6314
Frequently Asked Questions
SKU: SPDZ1-AFM-NPP
SPDZ1 AFM & NPP Exhaust Valve Simulators for C8 Corvette (2020-2024)
💡 Say goodbye to check engine lights when upgrading your C8 exhaust.
If you’ve installed an aftermarket cat-back exhaust on your 2020-2024 C8 Corvette that doesn’t include factory-style AFM (Active Fuel Management) or NPP (Dual-Mode Performance) valves, you’ve likely seen the dreaded CEL (Check Engine Light). These plug-and-play AFM/NPP valve simulators are the proven solution.
🔧 How They Work
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Plugs directly into your C8’s factory exhaust valve harness
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ECU is “tricked” into thinking the valves are still present
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No cutting, no splicing — just connect, zip-tie out of the way, and drive
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Prevents AFM/NPP valve malfunction codes and CEL warnings
✅ Why You Need Them
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Aftermarket Exhaust Upgrade: Almost every C8 with an aftermarket exhaust needs AFM simulators.
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Performance Models (NPP): If your C8 came with the factory Valved Performance Exhaust, you’ll also need NPP simulators unless your new exhaust has valves.
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Base Model Exhausts: Only AFM simulators are required.
📦 Fitment Guide
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Base Model Exhaust (Non-Valved): Requires 1 pair (AFM only) to avoid CEL.
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Performance Model Exhaust (Valved/NPP): Requires 2 pairs (AFM + NPP) to avoid CEL.
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This listing is for ONE PAIR.
🔥 Key Benefits
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Eliminates CELs caused by missing AFM/NPP valves
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Seamless integration with factory wiring
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Works with all 2020, 2021, 2022, 2023, and 2024 C8 Corvettes
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Plug-and-play installation (no permanent modifications)
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Built tough for long-lasting reliability
Upgrade your C8 the right way — enjoy your aftermarket exhaust sound without the hassle of warning lights or error codes.
Our History
For 23 years Speedzone Performance LLC has been providing aftermarket car parts to Central Floridians and 1000's of customers online. What makes us different than all the other places online? We have 3 actual brick and mortar locations where were serve customers daily and find new ways to provide support and assistance to the automotive community at large. From our in house SPDZ1 Brand, to our constantly growing in stock inventory, we strive to make our customer service and ease of purchase stand out from the rest! We are also one of the largest automotive part financing providers anywhere in the United States, and continue to provide more options for our customers every year. We love what we do, and it shows in every product we sell and every new customer who becomes a part of our Speedzone Family.