Product details
OVERVIEW
Swift Springs' Spec-R line uses the company's signature small-ID, high-travel spring design for a more linear rate through the shock's travel than a typical high-ID lowering spring. For the E9x M3, the Spec-R kit lowers ride height for street and track use while working with the factory S65 V8's damper valving.
SPECS
- Front spring rate: 5.0 kgf/mm
- Rear spring rate: 12.0 kgf/mm
- Front drop: approx. 1.0 in
- Rear drop: approx. 0.7 in
- Swift small-ID, high-travel spring construction
PARTS INCLUDED
- Front and rear Spec-R lowering springs (set of 4), as supplied by Swift Springs
TECH RESOURCES
Additional Parts Required
- None. Swift Springs specifies no additional hardware beyond the factory strut/shock assembly for installation.
Installation
- Swift Springs does not publish an installation PDF or a vehicle-specific install video for this kit; installation follows standard spring-compressor procedure onto the factory struts/shocks.
PART NUMBER
- 4X903R
VEHICLE APPLICATIONS
| Make | Model | Chassis | Engine | Years |
|---|---|---|---|---|
| BMW | M3 | E90 | S65 4.0L V8 | 2008–2011 |
| BMW | M3 | E92 | S65 4.0L V8 | 2008–2013 |
| BMW | M3 | E93 | S65 4.0L V8 | 2008–2013 |