Sale

Stillen

SDF Coil Over Suspension System

$1,902.44 $1,674.15 Save $228.29

SKU: GSM00-DUSS1

In Stock
In Stock
Ships by Aug 31
Free Shipping over $200
$100 Minimum Order
30 Days Return

Description

This system aims to provide drivers with improved ease of drift control through comprehensive damper tuning. The kit includes all necessary components for installation: adjustable shocks or struts, main springs, pillowball upper mounts, lower spring seats, seat locks, rubber bump stops, hook spanners, and dust covers. The coilovers feature a twin-tube shell case for durability, a full-length adjustment system for separate ride-height and preload tuning, and 16 levels of damping force adjustment for versatility. Threaded parts are coated with Fluorine to prevent adherence and rust, while lower brackets use electroless nickel plating with a clear coating. Key specifications include front spring rates of 448 lbs per in (8 kg per mm) and rear spring rates of 336 lbs per in (6 kg per mm). The ride height is lowered by -0.7 inches in the front and -1.3 inches in the rear. The upper mounts are pillowball type. This product is specifically designed for the 1986-1991 Mazda RX-7.

Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.

Fitment

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Specifications

BrandStillen
Part NumberGSM00-DUSS1
CategorySuspension and Components

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Returns & Fitment

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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Shipping

Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.

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