Upgrade your 2017 to 2021 Civic Si with the Rev9 Hyper-Street II coilover suspension, featuring advanced mono-tube shocks and 32 levels of rebound adjustment. Designed for superior performance, the mono-tube shocks boast a larger gas and oil capacity, significantly enhancing the comfort of lowered vehicles. With 32 precise adjustment valving clicks, you can fine-tune the rebound force to your exact preference. The coilovers also offer independent spring tension and full-length adjustability, allowing you to lower your Civic Si without compromising comfort, thanks to the optimized pitch distance. Fitment Information Honda Civic Si FC/FK (2017, 2018, 2019, 2020, 2021) Specs & Features 32 way adjustable dampers (soft to firm) 7kg front and 6kg rear springs Includes front camber plates Height adjustment range of about 1" drop from max height to about 3" maximum drop Includes a full set of 4 One year warranty when purchased through Redline360 (an Authorized Rev9 Dealer) Part Number: R9-HS2-124 Product Description Looking for coilovers but don't want to break the bank? Rev9 budget coilovers are considered one of the best "cheap" coilovers on the market and provide you with features that are just not found on other coilovers in this price range.  Includes top hats and 32 way adjustable dampers with height adjustable shocks, these Rev9 coilovers are perfect for those who want to replace all of their shocks and have a height adjustable coilover suspension.   Excellent balance between comfort and performance and designed for those who daily drive their cars. Rev9 put these to the test and have compressed the springs over 600,000 times to ensure they are long lasting! Of those tests, the distortion rate was only 0.04% - meaning these are built to last! Redline360 is an authorized Rev9 dealer and Rev9 validates their warranty when you purchased through us.