Dinan Iridium Spark Plug - B48/B58/S58 Heat Range 9 (Flat) - Single

The Dinan Iridium Spark Plug uses an iridium electrode with a copper core to run cooler, resist preignition, and fire reliably at lower required voltage than a standard plug. Rated at heat range 9 and one step colder than OEM on Gen 1 B48, Gen 1/2 B58 and S58 engines, it suits tuned and stock setups alike and pairs well with Dinan ignition coils. The projected ceramic insulator and optimized electrode design help ignite hard-to-burn fuels such as ethanol. Sold individually.

Specifications

Shipping

• In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
• Standard, expedited, and overnight options at checkout.
• Oversized items ship by freight and take longer.
• Backordered items ship as soon as stock lands — contact us for lead times.
• International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.

Returns

• 30-day returns on new, uninstalled items in original packaging with all hardware.
• Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
• Installed or used parts can’t be returned — confirm fitment before you install.
• Special orders and custom items are final sale.
• Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Refund Policy