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HKS 50003-M45i Iridium M-Series Super Fire Racing Spark Plug

(Audi S4 2000-02, A4 Quattro 1996-2008, A6 Quattro 1995-2011, TT Quattro 2000-03, A4 1997-2008, A3 2006-08, A8 Quattro 1999-2009, S8 2001-03 + 145 more models)

Part of: HKS M-Series Super Fire Racing Iridium Spark Plug

Other options in this family: HKS 50003-M45iL HKS 50003-M45HL HKS 50003-M45XL HKS 50003-M50HL HKS 50003-M40XL

Manufacturer

Picture for manufacturer HKS

Part Number

50003-M45i
12 reviews
Sale Price

$270.00

In Stock (9)

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Usually delivered within 2 days

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Fitment guaranteed

Fitment guaranteed

Product Details

The HKS M-Series Super Fire Racing Spark Plug is a high-performance iridium spark plug engineered for enthusiasts demanding superior ignition performance, extended durability, and resistance to carbon buildup under high-load conditions. Each plug is sold individually.

Key Features:

  • 0.6mm iridium alloy center electrode for concentrated spark energy and extended life
  • Outer electrode with platinum chip for enhanced durability and performance
  • Short-type outer electrode design minimizes vibration and improves reliability
  • Thermal edge technology optimizes heat dissipation
  • Spark support gap ensures consistent ignition under demanding conditions
  • Nickel-coated housing prevents premature deterioration
  • Iridium alloy construction with 2454°C melting point tolerates extreme compression and minor detonation

The M-Series is specifically designed for turbocharged, supercharged, and high-compression engines where reliable ignition and resistance to fouling are critical. The ultra-fine iridium center electrode delivers a more focused spark while the platinum outer electrode ensures consistent performance over extended service intervals. Available in colder heat ranges (7 and up) for forced induction applications, with rotary-specific heat ranges of 9 and up.

Products specifications

Fits

Audi S4 2000-02, A4 Quattro 1996-2008, A6 Quattro 1995-2011, TT Quattro 2000-03, A4 1997-2008, A3 2006-08, A8 Quattro 1999-2009, S8 2001-03, TT 2001-06, S6 1995, 2002-03, Allroad Quattro 2001-05, RS6 2003; Honda Civic 1991-2012 + 140 more models

Heat Range

9

Never know til you try. Easy to use, see if the right part comes

simplicity is always good.

Product is what I wanted, An is all good.

Was looking for exact replacement turn signal for a 1988 Bunkhouse Motorcycle camper. You had the exact light. Perfect fitment!! Thanks so much!!

Thanks

They have the best prices and fast shipping too.

By far the best price, easy ordering, and fast service, what else is there?

Great price and fast shipping!

Best price I could find! Great customer service kept me informed through the whole order process to insure acuracy since it was being sent directly from the manufacture. Recieved my order in good time, right parts and no damage. Overall very satisfied and will be doing business again in the future.

Very competitive low prices and great product selection. Will definitely look to this vendor when purchasing automotive parts in the future.

Great prices and FAST shipping!! Definitely will buy products here again!

Although there was a mix up with the shipping on my order customer service was helpful and expedited the solution and made it worth my trouble. I will be keeping Autoplicity in mind for any other parts I might need for my Jeep.

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