Tein 17-21 Honda Civic Si (FC1/FC3) Flex Z Damper Kit Coilovers

Tein Flex Z Coilovers are one of the most versatile and best-performing suspension upgrades in their class—designed to offer street comfort, track-ready response, and a full suite of adjustability at an unbeatable price. Made entirely in Japan, they feature a sealed twin-tube damper system and provide full-length ride height adjustment without compromising spring preload. With 16 levels of damping adjustment, you can fine-tune both comfort and performance on the fly—soften it for daily commutes or stiffen it up for backroad attacks and autocross events. The damping range is specifically tuned for real-world use, balancing smooth road manners with high-speed composure. Most front setups include pillowball camber plates for precise alignment tuning (McPherson applications), while rear configurations are optimized per chassis. Tein’s sealed insert design eliminates the need for full damper rebuilds, offering long-term serviceability with replacement inserts. With powder-coated damper bodies, zinc-treated threaded sleeves, and OE-quality mounts, Flex Z coilovers are built to withstand years of abuse and seasonal driving. 16-way damping force adjustment for custom tuning on demand Full-length ride height adjustability preserves suspension geometry Front pillowball camber plates included on applicable models Durable sealed twin-tube design with replaceable inserts OEM-fit brackets and mounts for easy installation Corrosion-resistant coatings for year-round reliability Engineered and manufactured in Japan for unmatched consistency