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Upgrade your vehicle's ignition system with the HKS Nissan/Infiniti VQ35HR M-Series Stock Heat Spark Plugs. Designed specifically for Nissan and Infiniti models equipped with the VQ35HR engine, these spark plugs ensure reliable ignition performance and optimal combustion. Crafted with precision, they feature a stock heat range suitable for everyday driving and moderate performance applications, providing a seamless fit and dependable operation.
Constructed with high-quality materials, these spark plugs offer excellent durability and resistance to wear. The M-Series design enhances ignition efficiency, promoting smoother engine response and improved fuel economy. Whether you're maintaining your vehicle or seeking a replacement that meets OEM standards, the HKS hks50003-M40HL spark plugs deliver consistent performance and long-lasting reliability.
Installation is straightforward, making these spark plugs an ideal choice for both professional mechanics and DIY enthusiasts. They are compatible with a variety of Nissan and Infiniti vehicles powered by the VQ35HR engine, ensuring a precise fit and optimal operation. Trust HKS to provide quality automotive components that meet the highest standards for performance and safety.
Features:
Order Processing
All orders are processed and shipped within 24 hours of purchase (excluding weekends and holidays).
Orders placed after 3:00 PM EST may ship the following business day.
Shipping Methods
Customers select their preferred shipping method and speed at checkout.
Shipping times are determined by the carrier and cannot be guaranteed by us.
Tracking information will be provided once your order has shipped.
Shipping Coverage
If your package arrives damaged, please notify the delivery driver immediately and contact the shipping carrier to file a claim.
You must report any missing or damaged items within 14 days of delivery.
After this time, we cannot be held responsible for lost or damaged items.
Return Window
You have 30 days from the date of delivery to request a return.
After 30 days, we are unable to accept returns, exchanges, or refund requests.
Eligibility
Items must be returned in their original condition—unused, unwashed, and with all tags and packaging intact.
Certain products may not be eligible for return (e.g., special-order items, customized products, or perishable goods).
Items that have been altered, installed, or modified cannot be returned.
Return Process
Contact our Customer Support team to request a Return Authorization (RMA) before sending items back.
Once your return is approved, you’ll receive instructions on where to send the product.
Customers are responsible for return shipping costs unless the item was defective or incorrect.
Refunds
Refunds are issued to the original payment method once the returned item has been received and inspected.
Please allow 5–10 business days for the refund to appear on your account.
In some cases, a restocking fee may apply (if applicable, this will be disclosed during your return authorization).
