ST Coilover Kit 08-13 BMW 128i/135i RWD E88 Convertible

For all those who want to influence more than just their ride height. ST XA Coilovers deliver the look you need through a wide range of height adjustment. With an extensively adjustable damper setup, you can precisely adjust the driving behavior of your car to achieve enhanced road control without a compromise in comfort. ST XA Coilover kits deliver precise adjustment to your ride height and look of your car. We manufacture the adjustable spring perch made of durable and friction-optimized polyamide composite material with a stainless steel insert. Thanks to the composite material corrosion is prevented between the strut and perch ensuring long lasting height adjustability while the stainless steel insert provides strength and confidence! ST XA Coilovers come preset to our factory recommended damper settings, the same configuration we test them at on our KW shock dynos before they go into your box. The 16 distinct clicks of adjustable rebound damping allow you to refine the driving dynamics with a simple turn of the adjustment knob. Each kit includes a detailed damper setup manual making it easy to reset to our recommended setting at any time. Whether your preference is comfort, sportiness, or something in between; ST XA puts the finer details of the driving dynamics in your hands. Galvanized zinc coated steel struts optimize corrosion protection for long lasting use. We add a dust protection system to prevent unwanted dirt and particulate from coming in contact with the hardened chrome piston rod or getting into the valve packs. We reinforce the system with a multi-layered pressure resistant sealing package, mono block guide system and a low friction piston band which works inside the pressure resistant internal damper housing.

Additional Information

ST XA Coilovers deliver the look you need through a wide range of height & damping adjustment. Precisely adjust the driving behavior of your car to achieve enhanced road control without compromising comfort.

Application Summary

2008-2013 BMW 1 Series (E88) Convertible 128i+135i

Part Type

Coilover Adjustable Spring Lowering Kit

• 5 Year Limited Warranty - Unlimited Mileage
• Composite spring perch made from wear-resistant, friction-optimized polyamide composite with an embedded stainless-steel insert. The polyamide composite prevents oxidation while the stainless-steel insert maximizes strength.
• Elastomer Bump stop with integrated dust protection system prevents water and dirt particles reaching the piston rod and seals. The highly resilient bump stops act as dynamic load limiters while maintaining ride quality and durability.
• Made in Germany
• Seamless Ride Height Adjustment - ST's composite spring perch and unique trapezoidal thread pitch make ride height adjustability a breeze so you can dial in your preferred look
• ST coilovers are built by hand by the experts at KW in Fichtenberg, Germany. Each damper is tested on a shock dyno to verify it's making the proper forces before being put into the ST box.
• ST XA coilovers feature adjustable rebound damping which puts you in control of how comfortable or sporty your car feels.
• Zinc galvanized steel housing for improved resistance to corrosion.

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Product Downloads

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1.	Installation Instructions

Installation guides, warranty details, and other supporting documents are provided by the supplier. In some cases, these files may originate from regions outside your locale, meaning instructions, warranty procedures, and images may not fully align with your specific vehicle or region (e.g., LHD vs. RHD differences, return policies, etc.). If you need clarification, please contact a StreetFX support agent.

Reference Information

ST XA Height, Rebound Adjustable Coilover Kit; BMW 1 Series, E88 Convertible

ST Suspensions ST XA coilover kits offer more than lowering. With the adjustable dampers, you can influence more than just the ride height of your car.

ST XA coilovers come preset to ST Suspension's factory recommended damper settings, the same configuration they test them at on their KW shock dynos before they go into your box. The 16 distinct clicks of adjustable rebound damping allow you to refine the driving dynamics with a simple turn of the adjustment knob. Each kit includes a detailed damper setup manual making it easy to reset to ST's recommended setting at any time. Whether your preference is comfort, sportiness, or something in between; ST XA coilover kits put the finer details of the driving dynamics in your hands.