HKS Super Fire Racing M40i Performance Ignition Coil
HKS Super Fire Racing M40i Performance Ignition Coil
HKS Super Fire Racing M40i Performance Ignition Coil
HKS Super Fire Racing M40i Performance Ignition Coil

HKS Super Fire Racing M40i Iridium Spark Plug (NGK 8, ISO) - 10 Pack

HKS SKU: HKS50003-M40I
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The HKS Super Fire Racing M40i is an ISO-type iridium spark plug with an NGK 8 equivalent heat range, for tuned and stock performance engines. Its 0.6 mm iridium center electrode and platinum-chip outer electrode lower the required firing voltage for strong ignition under high boost or lean conditions, while the thermal edge and spark-support gap resist carbon fouling. The ISO seat fits a wide range of Japanese turbo and naturally aspirated engines (RB, SR, VG, and similar) calling for an ISO φ14 plug. Sold as a 10-pack (wholesale case); a typical engine needs one plug per cylinder.

Specifications

Product Line Super Fire Racing M-Series
Heat Range NGK 8 equivalent
Seat / Type ISO type
Thread φ14 x 19 mm
Hex (Wrench) 16 mm
Center Electrode 0.6 mm iridium
Quantity 10 plugs (case)
Part Number 50003-M40I

Shipping

  • Orders placed before 3 PM EST typically ship the same business day. Larger items ship within 1 to 3 business days.
  • Standard, expedited, and overnight options at checkout.
  • Oversized items ship by freight and take longer.
  • Special order items follow a lead time we confirm with you individually before the order is committed.
  • Backordered items ship as soon as stock lands. Lead times are manufacturer estimates and can change. Contact us for current ETAs.
  • Need to cancel? Email us right away. Cancellations are not guaranteed once an order is in process. In-stock orders cancel free before they ship; a 6% fee applies only to confirmed backorders and special orders.
  • 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 days from delivery to request and ship back a return on new, uninstalled items in original packaging with all hardware.
  • Standard returns: 8% restocking fee on the item price before tax and shipping. Shipping is not refunded in either direction. All waived if the item is defective or we made the error.
  • Fitment guaranteed: select your vehicle above, or confirm fitment with us in writing before you order. If the part shows as a fit and it is wrong, the return is on us, even after installation. Otherwise, installed or used parts cannot be returned.
  • Final sale: special orders, coilovers, electronics, engine internals, turbochargers, superchargers and turbo kits, unless defective or we sent the wrong item.
  • Product images may be representative. The SKU and specifications in the listing are what ships.
  • Email us for return authorization before shipping anything back.

Full details: Shipping Policy · Returns & Refunds · Warranty
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