K5 Optima Store

They work great!! The original plugs are trash on 21 Kia k5 1. 6t after I replaced w these plugs my car gets so much better gas!!

Sounds amazing not bad to install took around 2 hours with basic tools.

Solidly built and very easy to install. The car feels more planted in very hard cornering.

Fast shipping

Incredible customer service, quick shipping, and the best supply of parts for your K5. I’ll be sending all my business to these guys.