Tein Street Basis dampers are an evolution of the popular Basic coilover featuring updated internal components and external coatings for increased durability and performance. Made in Japan under strict quality control standards and developed by highly trained suspension engineers, Tein's new Street Basis coilovers for the Civic Si are an entry-level setup that feature ride-height adjustment but do not offer adjustable shock damping. Street Basis are valved for street use and are an affordable, balanced solution to purchasing shocks and springs or sleeve-type coilovers. Street Basis coilovers are a complete twin-tube design setup, they offer increased stroke over a stock-type setup or spring and shock package, which increases shock life and prevents the 'bottoming out' associated with traditional lowering springs. This kit is also completely rebuildable, making it a suitable long-term solution for most styles of performance street driving.

Tein Street Advance Coilovers, an evolution of the Super Street, offer the same ride-height adjustability of the Basis but also feature 16-setting damping force adjustment for increased tuneability. Designed for street use, Tein SS coilovers can be stiffened or softened and raised or lowered to meet any of your day-to-day demands. SS coilovers are designed specifically for the US market, so fitment and quality is perfect every time. The Tein Street Advance kit features twin-tube shocks, standardized straight springs, and steel construction for durability and quality. The kits can also be rebuilt and revalved by Tein, making them a complete long-term suspension solution. The Street Advance coilovers utilize the OEM upper mounts for simple installation.

Tein Type Flex coilover suspension kits are designed to turn your Civic Si into the superb handling machine it should be without sacrificing too much comfort. Tein incorporated seperate height and preload adjustments, which allows you myriad adjustments for all road, autocross and track conditions. Tein's twin-tube dampers are made for outstanding reliability and longevity. The Tein Flex damper kit includes pillow ball upper mounts and is compatible with the EDFC, for maximum performance for the streets.

Mono Flex coilovers are designed for those Civic Si drivers looking for the best performance on the street and track. They are very similar to the Tein Flex coilovers featuring full ride height adjustment and 16 levels of damping. The major difference is the mono-tube internal damper design. This allows quick heat dissipation for consistent handling and a larger damping range as well. Tein Mono Flex coilovers include upper mounts, and are compatible with the electronic damping force computer (EDFC). They are also fully rebuildable, making them a long-term solution.

This optional product makes it possible for the driver to control the damping force by controlling a motor installed in the shock absorber while being seated in the driver's seat. Since the damping force can be manually controlled with ease to meet different situations, the driver can enjoy variations in the suspension setting. Go from living your life a quarter mile at a time to Sunday cruising at a buttons press. The EDFC can control the 16 different stiffness settings and can also be put into 32 setting mode which adjusts in half-step increments for the purists and control freaks. The compact (approximately 3.5" wide x 1" tall x 4" deep) control box is easy to mount, making it a great add-on.