E3 Spark Plugs Parts & Accessories

E3 Spark Plugs use patented DiamondFire electrode technology to deliver more complete combustion on Harley-Davidson V-twin engines — the E3.36 and E3.34 models are designed specifically for H-D applications, with a two-legged ground electrode that handles V-twin vibration while improving heat transfer and combustion efficiency.

Independent testing shows up to 12% power increase and reduced fuel consumption. A bolt-in upgrade at standard plug pricing that gives you something measurable in return.