No hassle
returns
Live in-stock
inventory
Save over
60% retail
You have no items in your shopping cart.
07/16/2029 10:00 AM
Summer Sale Price $44.89
In Stock (22)
Usually delivered within 2 days
Free Shipping
Part number: 50003-M40i
Product Details
HKS 50003-M40i Iridium Spark Plugs
Products specifications
Heat Range 8

ALL PLUGS SOLD INDIVIDUALLY

HKS S-Series Super Fire Racing Spark Plugs

HKS S-Series Super Fire Racing Spark Plugs are high performance Iridium plugs designed to handle advanced levels of tuning and still offer easy start-up and smooth idling.

  • 0.4mm diameter Iridium plug electrode core
  • U-shaped grooved electrode
  • S-Series Super Fire Spark Plugs are recommended for smooth cold starting, response and acceleration.

M-Series Super Fire Spark Plugs

HKS M-Series spark plugs are high performance Iridium plugs designed to provide improved ignition performance, durability and anti-carbon build-up.

  • 0.6mm Iridium Alloy Center Electrode
  • Outer Electrode with Platinum Chip
  • Short Type Outer Electrode (Anti-Vibration)
  • Thermal Edge
  • Spark Support Gap

*M Series is recommended for reliable ignition, durability and anti-carbon buildup under high load.

The Iridium alloy is used because of its durability and reliability. On an average plug, a narrow core typically shortens life span of plug but with the intense durability of iridium there is no sacrifice in any longevity. With a high melting point of 2454 degrees C, opposed to the 1769 degrees C of white gold, the electrode can tolerate the high levels of compression and minor knocking without any deterioration. A nickel coating on the housing also prevents the spark plug from premature deterioration. The Iridium plugs are available for multiple applications and offered in colder heat ranges of 7 and up and specifically for rotary, heat ranges of 9 and up are offered.

Reviews
Add your review
E
Lowest price, fast shipping, great service. I'll be back!
C
They have the best prices and fast shipping too.
T
Great price and fast shipping!
D
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.
Fitment
Acura Integra
2001 Acura Integra Type R
2000 Acura Integra Type R
1999 Acura Integra Type R
1998 Acura Integra Type R
1997 Acura Integra Type R
1996 Acura Integra Type R
1995 Acura Integra ALL / Type R
1994 Acura Integra ALL / Type R
1993 Acura Integra ALL / Type R
Acura MDX
2006 Acura MDX ALL
2005 Acura MDX ALL
2004 Acura MDX ALL
2003 Acura MDX ALL
Acura NSX
2005 Acura NSX ALL
2004 Acura NSX ALL
2003 Acura NSX ALL
2002 Acura NSX ALL
2001 Acura NSX ALL
2000 Acura NSX ALL
1999 Acura NSX ALL
1998 Acura NSX ALL
1997 Acura NSX ALL
1996 Acura NSX ALL
1995 Acura NSX ALL
1994 Acura NSX ALL
1993 Acura NSX ALL
1992 Acura NSX ALL
1991 Acura NSX ALL
1990 Acura NSX ALL
Acura RSX
2006 Acura RSX ALL
2005 Acura RSX ALL
2004 Acura RSX ALL
2003 Acura RSX ALL
2002 Acura RSX ALL
Acura Vigor
1995 Acura Vigor ALL
1994 Acura Vigor ALL
1993 Acura Vigor ALL
1992 Acura Vigor ALL
Audi A3
2008 Audi A3 ALL
2007 Audi A3 ALL
2006 Audi A3 ALL
Audi A4
2008 Audi A4 ALL
2007 Audi A4 ALL
2006 Audi A4 ALL
2005 Audi A4 ALL
2004 Audi A4 ALL
2003 Audi A4 ALL
2002 Audi A4 ALL
2001 Audi A4 ALL
2000 Audi A4 ALL
1999 Audi A4 ALL
1998 Audi A4 ALL
1997 Audi A4 ALL
Show All Vehicle Fitments
Return Policy
Returns are easy at THMotorsports
Not happy with a purchase? No problem. We've made returning items as easy as possible. And most purchases can be returned for free for 30 days. Learn more about our Returns Policy