SPDZ1 AFM & NPP Valve Exhaust Simulators for C8 Corvette (2020-2024) - PAIR
Couldn't load pickup availability
Refresh
Sold by Carkart, an authorized reseller.
Returns accepted within 30 days | support@buycarkartvogue.com
Verified
Shipping Information
Shipping calculated at checkout
Shipping cost and estimated delivery for this item will be shown at checkout based on your location.
Processing Time: 1–3 business days
Tracking number sent via email once dispatched
Orders over $250 require signature upon delivery.
Taxes calculated at checkout.
Returns & Refund
Returns accepted within 30 days of delivery.
Damaged or Defective Item
Free return shipping + replacement or full refund
Wrong Item Received
Free return shipping + replacement or full refund
Change of Mind
Return shipping at customer's expense · 25% restocking fee applies
Return Authorization (RA) number before sending.
View Full Return & Refund Policy
⚠️ California Proposition 65 Warning :
Your Cart
Item(s):
Total: $30.51
SPDZ1 AFM & NPP Valve Exhaust Simulators for C8 Corvette (2020-2024) - PAIR
$65.00
Add to Cart
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
Plugs directly into your C8’s factory exhaust valve harness
ECU is “tricked” into thinking the valves are still present
No cutting, no splicing — just connect, zip-tie out of the way, and drive
Prevents AFM/NPP valve malfunction codes and CEL warnings
✅ Why You Need Them
Aftermarket Exhaust Upgrade: Almost every C8 with an aftermarket exhaust needs AFM simulators.
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.
Base Model Exhausts: Only AFM simulators are required.
📦 Fitment Guide
Base Model Exhaust (Non-Valved): Requires 1 pair (AFM only) to avoid CEL.
Performance Model Exhaust (Valved/NPP): Requires 2 pairs (AFM + NPP) to avoid CEL.
This listing is for ONE PAIR.
🔥 Key Benefits
Eliminates CELs caused by missing AFM/NPP valves
Seamless integration with factory wiring
Works with all 2020, 2021, 2022, 2023, and 2024 C8 Corvettes
Plug-and-play installation (no permanent modifications)
Built tough for long-lasting reliability
This purchase includes (1) Pair - (2) Simulators
Upgrade your C8 the right way — enjoy your aftermarket exhaust sound without the hassle of warning lights or error codes.
SPDZ1 Product Warranty Registration
Purchased an SPDZ1 product from Speedzone? Register your SPDZ1 product here
FAQs
Have a question ? We are here to help.
Is the shipping free?
Yes, we offer free standard shipping on all orders within the United States.
When will I receive my item?
Domestic orders typically arrive within 3-5 business days . Delivery times are estimated and may vary depending on your location, weather conditions, or other unforeseen factors.
Can I change or return my item?
We hope you love your purchase, but if you need to make a change or return your item, we’ve got you covered! You can initiate a return or exchange within 30 days of receiving your order. Please ensure the product is in its original condition and packaging. For more information on our return policy, please visit our Returns & Exchanges page.
<div class="dynamic-checkout__content" id="dynamic-checkout-cart" data-shopify="dynamic-checkout-cart"> <shopify-accelerated-checkout-cart wallet-configs="[{"supports_subs":true,"supports_def_opts":false,"name":"shop_pay","wallet_params":{"shopId":69204410420,"merchantName":"Carkart","personalized":true}},{"supports_subs":false,"supports_def_opts":false,"name":"amazon_pay","wallet_params":{"checkoutLanguage":"en_US","ledgerCurrency":"USD","placement":"Cart","sandbox":false,"merchantId":"A1ONOTYM25CI4M","productType":"PayAndShip","design":"C0002"}},{"supports_subs":true,"supports_def_opts":false,"name":"paypal","wallet_params":{"shopId":69204410420,"countryCode":"US","merchantName":"Carkart","phoneRequired":true,"companyRequired":false,"shippingType":"shipping","shopifyPaymentsEnabled":true,"hasManagedSellingPlanState":false,"requiresBillingAgreement":false,"gatewayType":"MANAGED","merchantId":"PZG6E6657YATJ","sdkUrl":"https://www.paypal.com/sdk/js?components=buttons\u0026commit=false\u0026currency=USD\u0026locale=en_US\u0026client-id=AbasDhzlU0HbpiStJiN1KRJ_cNJJ7xYBip7JJoMO0GQpLi8ePNgdbLXkC7_KMeyTg8tnAKW4WKrh9qmf\u0026merchant-id=PZG6E6657YATJ\u0026intent=authorize","serviceableCountryCodes":["AC","AD","AE","AF","AG","AI","AL","AM","AO","AR","AT","AU","AW","AX","AZ","BA","BB","BD","BE","BF","BG","BH","BI","BJ","BL","BM","BN","BO","BQ","BR","BS","BT","BW","BY","BZ","CA","CC","CD","CF","CG","CH","CI","CK","CL","CM","CN","CO","CR","CV","CW","CX","CY","CZ","DE","DJ","DK","DM","DO","DZ","EC","EE","EG","EH","ER","ES","ET","FI","FJ","FK","FO","FR","GA","GB","GD","GE","GF","GG","GH","GI","GL","GM","GN","GP","GQ","GR","GS","GT","GW","GY","HK","HN","HR","HT","HU","ID","IE","IL","IM","IN","IO","IQ","IS","IT","JE","JM","JO","JP","KE","KG","KH","KI","KM","KN","KR","KW","KY","KZ","LA","LB","LC","LI","LK","LR","LS","LT","LU","LV","LY","MA","MC","MD","ME","MF","MG","MK","ML","MM","MN","MO","MQ","MR","MS","MT","MU","MV","MW","MX","MY","MZ","NA","NC","NE","NF","NG","NI","NL","NO","NP","NR","NU","NZ","OM","PA","PE","PF","PG","PH","PK","PL","PM","PN","PS","PT","PY","QA","RE","RO","RS","RU","RW","SA","SB","SC","SD","SE","SG","SH","SI","SJ","SK","SL","SM","SN","SO","SR","SS","ST","SV","SX","SZ","TA","TC","TD","TF","TG","TH","TJ","TK","TL","TM","TN","TO","TR","TT","TV","TW","TZ","UA","UG","UM","US","UY","UZ","VA","VC","VE","VG","VN","VU","WF","WS","XK","YE","YT","ZA","ZM","ZW"]}},{"supports_subs":true,"supports_def_opts":false,"name":"google_pay","wallet_params":{"sdkUrl":"https://pay.google.com/gp/p/js/pay.js","paymentData":{"apiVersion":2,"apiVersionMinor":0,"shippingAddressParameters":{"allowedCountryCodes":["AC","AD","AE","AF","AG","AI","AL","AM","AO","AR","AT","AU","AW","AX","AZ","BA","BB","BD","BE","BF","BG","BH","BI","BJ","BL","BM","BN","BO","BQ","BR","BS","BT","BW","BY","BZ","CA","CC","CD","CF","CG","CH","CI","CK","CL","CM","CN","CO","CR","CV","CW","CX","CY","CZ","DE","DJ","DK","DM","DO","DZ","EC","EE","EG","EH","ER","ES","ET","FI","FJ","FK","FO","FR","GA","GB","GD","GE","GF","GG","GH","GI","GL","GM","GN","GP","GQ","GR","GS","GT","GW","GY","HK","HN","HR","HT","HU","ID","IE","IL","IM","IN","IO","IQ","IS","IT","JE","JM","JO","JP","KE","KG","KH","KI","KM","KN","KR","KW","KY","KZ","LA","LB","LC","LI","LK","LR","LS","LT","LU","LV","LY","MA","MC","MD","ME","MF","MG","MK","ML","MM","MN","MO","MQ","MR","MS","MT","MU","MV","MW","MX","MY","MZ","NA","NC","NE","NF","NG","NI","NL","NO","NP","NR","NU","NZ","OM","PA","PE","PF","PG","PH","PK","PL","PM","PN","PS","PT","PY","QA","RE","RO","RS","RU","RW","SA","SB","SC","SD","SE","SG","SH","SI","SJ","SK","SL","SM","SN","SO","SR","SS","ST","SV","SX","SZ","TA","TC","TD","TF","TG","TH","TJ","TK","TL","TM","TN","TO","TR","TT","TV","TW","TZ","UA","UG","UM","US","UY","UZ","VA","VC","VE","VG","VN","VU","WF","WS","XK","YE","YT","ZA","ZM","ZW"],"phoneNumberRequired":true,"format":"FULL-ISO3166"},"merchantInfo":{"merchantName":"Carkart","merchantId":"16708973830884969730","merchantOrigin":"buycarkartvogue.com"},"allowedPaymentMethods":[{"type":"CARD","parameters":{"allowedCardNetworks":["VISA","MASTERCARD","AMEX","DISCOVER","JCB"],"allowedAuthMethods":["PAN_ONLY","CRYPTOGRAM_3DS"],"billingAddressRequired":true,"billingAddressParameters":{"format":"FULL-ISO3166","phoneNumberRequired":true}},"tokenizationSpecification":{"type":"PAYMENT_GATEWAY","parameters":{"gateway":"shopify","gatewayMerchantId":"69204410420"}}}],"emailRequired":true},"customerAccountEmail":null,"environment":"PRODUCTION","availablePresentmentCurrencies":["USD"],"auth":[{"jwt":"eyJ0eXAiOiJKV1QiLCJhbGciOiJFUzI1NiJ9.eyJtZXJjaGFudElkIjoiMTY3MDg5NzM4MzA4ODQ5Njk3MzAiLCJtZXJjaGFudE9yaWdpbiI6ImNhcmthcnQuY29tIiwiaWF0IjoxNzkzMzk2NjQxfQ.g_tRsS2jDKs8S9pYrcR7i6t2P8IcTeCJBTuZvRpX5BHMWIkVvki_hAqUkKWLmgNSfGGlYpOyJLcA8sg8LXbjbw","expiresAt":1793439841},{"jwt":"eyJ0eXAiOiJKV1QiLCJhbGciOiJFUzI1NiJ9.eyJtZXJjaGFudElkIjoiMTY3MDg5NzM4MzA4ODQ5Njk3MzAiLCJtZXJjaGFudE9yaWdpbiI6ImNhcmthcnQuY29tIiwiaWF0IjoxNzkzNDM5ODQxfQ.b5RJ4NEEpZpKYd5ffGQ7fDwf4_MzUdjHbnfZmV2wszjMKvdR8Im-vKoKruSnhzvP1d_-0tEPBr8duQP6VmnOOQ","expiresAt":1793483041}],"cardsinkUrl":"https://checkout.pci.shopifyinc.com/sessions","cardsinkCallerIdentificationJwt":"eyJraWQiOiJ2MSIsInR5cCI6IkpXVCIsImFsZyI6IkhTMjU2In0.eyJjbGllbnRfaWQiOiIxMSIsImNsaWVudF9hY2NvdW50X2lkIjoiNjkyMDQ0MTA0MjAiLCJ1bmlxdWVfaWQiOiIwMU02N0M3SDY2NU41MjU1NDIyOUFaV041RiIsImlhdCI6MTc5MzM5NjY0MX0.wgJfzLCB69e9ytBBjApRsWUvqqRElsKs_iixF18ZWy4"}}]" access-token="20810d98afa2dc52788bfff7f8a52a25" buyer-country="US" buyer-locale="en" buyer-currency="USD" shop-id="69204410420" cart-id="hWNIaBZPxsKfJCUD0gOzYYgD" enabled-flags="["370070f3"]" requires-shipping > <div class="wallet-button-wrapper"> <ul class='wallet-cart-grid wallet-cart-grid--skeleton' role="list" data-shopify-buttoncontainer="true"> <li data-testid='grid-cell' class='wallet-cart-button-container'><div class='wallet-cart-button wallet-cart-button__skeleton' role='button' disabled aria-hidden='true'> </div></li><li data-testid='grid-cell' class='wallet-cart-button-container'><div class='wallet-cart-button wallet-cart-button__skeleton' role='button' disabled aria-hidden='true'> </div></li><li data-testid='grid-cell' class='wallet-cart-button-container'><div class='wallet-cart-button wallet-cart-button__skeleton' role='button' disabled aria-hidden='true'> </div></li><li data-testid='grid-cell' class='wallet-cart-button-container'><div class='wallet-cart-button wallet-cart-button__skeleton' role='button' disabled aria-hidden='true'> </div></li> </ul> </div> </shopify-accelerated-checkout-cart> </div>
