2017-2020 Honda Civic Si Pro ST Coilovers by Skunk2 Racing
Skunk2's Pro-ST coilover kit: designed for racing specifications, tested and proven over decades with winning race teams. By integrating top-level technology into an affordable street-spec coilover, our system is the perfect, budget-friendly solution for daily-driven performance vehicles.
Built with the daily-driven sports car in mind, our Pro-ST shock absorbers are shorter than factory units, lowering the vehicle by approximately 3 inches while maintaining full shock travel. Combined with 12-way damping adjustment and stiffer springs, this allows you to tune your setup for any driving environment.
The large 52mm seamless carbon steel monotube shock body increases strength and provides room for larger hydraulic pistons and valving, more shock oil, and an enlarged nitrogen chamber. These upgrades significantly improve compression and rebound response, drastically enhancing handling characteristics and providing extreme durability under the harshest conditions.
The shock body is threaded along its entire length on the outside to accommodate spring preload adjustment collars, while the inside features a threaded lower shock mount and collar. This allows for independent adjustment of ride height and spring preload, enabling corner-weighting to achieve optimal four-wheel corner balance without sacrificing ride comfort. Additionally, the shock body and threads are protected from the elements by a gold zinc electroplating, and the lower shock mounts are powder-coated.
After rigorous testing, we chose to install linear rate springs rather than progressive ones. Featuring spring rates of 10kg/mm front and 8kg/mm rear, linear springs provide more stable consistency under all varying weight loads, whether cornering or hitting bumps. This results in the most predictable vehicle feedback in every driving situation. Each 2.5-inch spring is made from the highest quality SAE9254V chrome-vanadium and is specifically forged to work with our oil-nitrogen filled struts, providing the ultimate balance of street and track performance.
Each Pro-ST coilover features a knurled knob machined into the top of the shock shaft. With 12 adjustment variations, you have complete control over your vehicle's ride comfort and handling. This allows for adjustments tailored to street or track use, and everything in between, in seconds without removing the wheels.
The strength of a suspension system is determined by its mounts to the chassis. Therefore, every Pro-ST kit includes aluminum, CNC-machined, anodized top mounts for maximum strength and protection from the elements. High-quality polyurethane bushings are included to maintain precise handling and feedback while retaining a cushioned feel for the street. Furthermore, padded spring seats at the top of each spring and nylon thrust washers at the bottom reduce friction and eliminate the noise often associated with spring bind in many coilover systems.
Features
- Heavy-duty 52mm seamless carbon steel shock body
- Monotube damper with high-pressure nitrogen
- Synthetic shock oil
- 12-way adjustable high-precision damper valving for street to track
- Chrome-vanadium SAE9254V spec racing springs
- Independently adjustable ride height and spring preload
- Spanner wrenches included
- Heavy-duty anodized top hats
- Linear 10kg/mm F / 8kg/mm R springs
Benefits
- Lowers vehicle stance
- Progressive track tuning
- Performance and street comfort
Applications
- 2017-2020 Honda Civic Si
What's in the box?
- 1 - Complete coilover system
Warranty
- Skunk2 Racing
Before Ordering
〇 About Import Consumption Tax
At Shafutoya Shopping Site, we pay the import consumption tax incurred at the time of import on your behalf, so there will be no additional charges beyond the total amount paid at checkout.
〇Confirmation of Compatibility
Since our entire product database is based on North American (USDM) vehicles, please confirm compatibility with Japanese (JDM) vehicles before ordering. (If you are unsure whether the listed product is compatible with your vehicle, please feel free to contact us. Our support team will be happy to look into it for you.)
If you place an order without confirming compatibility, we cannot accept returns due to incompatibility.
Please note that even if items are sorted by selecting the year, manufacturer, and vehicle model in the tabs on our top page, this does not necessarily mean they will fit Japanese model vehicles without modification.
All products have been translated into Japanese using translation software. As there may be confusing expressions, please contact us before ordering if you have any questions.
○ Regarding Shipping
Shipping costs are paid at the time of checkout. Shipping estimates are automatically calculated when you enter your shipping address on the checkout page. For large items such as body parts, there may occasionally be a significant discrepancy between the automatically calculated shipping cost and the actual cost. In such cases, we will contact you individually via email.
All products are generally shipped internationally from our US warehouse. Unlike domestic shipping in Japan, international shipping takes about 7 to 14 days, so please order with enough time to spare. If you are in a hurry, please contact us in advance to confirm the delivery date. Note that all products are transported by air; they are not shipped by sea.
○ Regarding Japanese Vehicle Inspection (Shaken) Compatibility
Please note that all products we handle are basically designed and manufactured outside of Japan. They are not compliant with the "Japanese Vehicle Inspection System," and we cannot provide strength calculation documents or similar paperwork for the Japanese inspection system. Therefore, all parts are sold for the purpose of "circuit, private property, or off-road use," and installation and use are at your own risk.
○ Regarding Warranty
Please check the contents immediately upon arrival. Since all products are shipped internationally from outside Japan, there may be shipping damage to the packaging or the product. Please understand that we will only provide returns, refunds, or replacement exchanges if you contact us within 7 days of receipt regarding products with shipping damage, defective products, or incorrect items. Please note that for products sold through us, warranty support will be provided "only through us." We do not provide support through other companies or distributors located within Japan.