"Bought this plug during a tune up of a 5hp Briggs & Stratton mower. I got an unbelieveable difference! Way more power. I have a mulching mower and with thick grass I used to have to knock the grass"...(read full reviews)

DENSO IRIDIUM POWER SPARK PLUGS (1 review) product details

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"Iridium is the second densest element (after osmium) and is the most corrosion-resistant metal, even at temperatures as high as 2000 °C. , part of the platinum family. Because of the high density and"...(read full reviews)

CHAMPION TRUCK SPARK PLUGS (1 review) product details

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"I put a set of these in my 1994 f-150 with a 5.0 in it. And let me tell you some thing it ran smooth! Like it was new!!!! THANK YOU..."...(read full reviews)

SPLITFIRE® PERFORMANCE SPARK PLUGS (1 review) product details

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"I have a 2001 HD Wide Glide, as soon as I put them in I couldn't believe the difference, they are great. I also have a 2004 Drifter 800 CC which I will order now."...(read full reviews)

E3™ AUTOMOTIVE SPARK PLUGS (25 reviews) product details

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"I just installed these on my car and noticed an immediate difference. I haven't had them in long enough to see if there is a change in my mpg, but I definitely notice an improvement in acceleration"...(read full reviews)

SPLITFIRE® TRIPLE PLATINUM SPARK PLUG (3 reviews) product details

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"I have not installed them yet, but, this is my second set and I know they work as advertised! The only bad thing is that JCW sent me somebody elses returned plugs. Evident from the grease thumb prints"...(read full reviews)

ACCEL® U-GROOVE™ RACE-PROVEN HIGH-PERFORMANCE HEADER PLUGS (1 rating) product details

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SPLITFIRE® PERFORMANCE SPARK PLUGS (1 rating) product details

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