Designed and manufactured to SMP's strict quality standards, so you can install with confidence. Engineered and tested to match OE for spark energy output, impedance, and durability. Advanced thermoplastic coil connector ensures proper connection and resists fractures caused by heat and thermal cycling. High-temp boot prevents high-voltage leaks, while stainless-steel spring with internal ferrite noise suppressor prevents radiofrequency interference (RFI). Isolator manufactured using high voltage-resistant thermoplastics to prevent premature coil failure.