HKS Super Fire Racing M45i Iridium Spark Plug (NGK 9, ISO) - Single

The HKS Super Fire Racing M45i is an ISO-type iridium spark plug with an NGK 9 equivalent heat range, for tuned Japanese turbo and naturally aspirated engines (RB, SR, VG, Z32, and similar) using an ISO φ14 seat. The 0.6 mm iridium center electrode and platinum-chip outer electrode lower firing voltage for strong ignition under high boost or lean conditions, with thermal-edge anti-fouling. 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