If your car's running rough or misfiring, this Spectra Premium ignition coil is exactly what you need. It's made to meet or exceed original equipment specs, so it fits perfectly and works exactly like the factory part. The 100% copper windings in both primary and secondary circuits mean better conductivity and reliability than cheap alternatives. They test these things like crazy - thermal shock testing from -50 to 300°F to make sure they handle extreme temperatures and vibrations without failing. Each coil gets road tested too, so you know it actually performs in real world conditions. Seriously, don't mess around with no-name ignition coils that might fail in six months - this Spectra Premium unit is proper quality that'll last. The high voltage enamel coating insulation ensures it won't short out either. If your mechanic says you need a new ignition coil or you're doing the work yourself, this is the one to get. It might cost a bit more than the absolute cheapest option, but you won't be replacing it again next year. Just solid, reliable performance that gets your engine running smooth again.