Free Shipping

Orders $250+ free-shipping in USA.*

Best Price Guarantee

We match or beat any price.

0% APR Financing

Install now, pay later.

Authorized Retailer

Official partner of top brands.

Product Details

RS-R Down Sus lowering springs for the 2015-2023 Ford Mustang Ecoboost drop the car into a cleaner, more purposeful stance while tightening body roll and sharpening turn-in on everyday roads. Each set is engineered specifically for this Mustang chassis, so drop, spring rate and factory damper tune stay in balance — the car sits where you want it and still drives like a daily.

Racing Studio-R built its first suspension in Osaka in 1972 and has been refining the Down Sus spring for more than fifty years. Each set is progressive-rate, cold-wound and heat-treated in-house in Japan, then matched to the factory shock valving and ride-height target of the specific chassis it bolts onto. Backed by RS-R’s 3-year / 50,000 km fatigue warranty.

Features

  • Progressive-rate coil tuned to the factory damper
  • Vehicle-specific drop and rate — no universal cuts
  • Cold-wound from high-grade SAE alloy steel
  • Powder-coated for long-term corrosion resistance
  • 3-year / 50,000 km RS-R spring-fatigue warranty
  • Made in Osaka, Japan

Availability

This application is a special-order item. Lead time from Japan is approximately 3–6 months by standard sea freight. Expedited DHL/FedEx/UPS shipping from Japan is available for an upcharge when stock is on hand — contact us for current lead time.

Specifications
Part Number FO110D
Part Name RS-R Down Sus Lowering Springs
Vehicle 2015-2023 Ford Mustang Ecoboost
Ride-Height Adjustable No
Spring Type Progressive
Approximate Drop - Front -25mm to -30mm (-1.0inch to -1.2inch)
Approximate Drop - Rear -25mm to -30mm (-1.0inch to -1.2inch)
Spring Rate - Front 2.94 Kg/mm
Spring Rate - Rear 11.20 Kg/mm
Warranty 3 Years / 50,000 km
Vehicle Fitment
  • 2015 Ford Mustang Ecoboost
  • 2016 Ford Mustang Ecoboost
  • 2017 Ford Mustang Ecoboost
  • 2018 Ford Mustang Ecoboost
  • 2019 Ford Mustang Ecoboost
  • 2020 Ford Mustang Ecoboost
  • 2021 Ford Mustang Ecoboost
  • 2022 Ford Mustang Ecoboost
  • 2023 Ford Mustang Ecoboost
Go