Product Details
BC Racing BR Series Coilovers for the 2002-2006 Infiniti Q45 (F50) are BC Racing's entry-level coilover and the most popular kit in their entire lineup — they offer the most accessible entry into adjustable coilover suspension without sacrificing performance, comfort, build quality, or handling. Every kit is extensively tested on the F50 chassis and refined until it balances ride quality with performance — the reason Q45 coilovers from BC Racing are the best-selling adjustable kits in their segment worldwide.
Every BR Series kit is built around a mono-tube damper with simultaneous compression and rebound adjustment at every corner — a wide damping range without the complexity of a race-only setup. Ride height is fully adjustable independent of spring preload, so you set the stance and the ride separately. The off-the-shelf setup from BC Racing is deliberately balanced — spring rates and valving chosen so the kit feels comfortable day-to-day without giving up performance when you push it. Drivers who want a different recipe can spec Swift Springs, custom spring rates, or fully custom valving at checkout; BC will tune the dampers to match, which is a depth of customization most brands only offer on their top-tier kits.
BC Racing's reputation in the aftermarket suspension world is built on four things: competitive pricing that beats the rest of the fully-adjustable market, customization depth that rivals the top-tier race brands, long-term reliability earned over 20 years of production, and a rebuildable design that keeps the same set of dampers serving you through multiple builds. These Q45 coilovers arrive tuned for the F50 chassis and ready to bolt in — no break-in period, no guessing at setup. Every kit ships with a 2-year manufacturer warranty, lifetime access to BC service parts (pistons, seals, shafts — no unit replacement required when it's time for a rebuild), and in-house tech support from both BC Racing and the Springrates team.
Features
- 30-level simultaneous compression/rebound damping adjuster
- Mono-tube damper with linear piston and hardened chrome shaft
- Ride height adjustable independent of spring preload
- Upper mount hardware varies by chassis — camber plates, pillowball, or reused OEM mounts. See the Specifications table for what's included on your kit.
- Swift Spring and custom spring rate upgrades available at checkout
- Custom damper valving paired with custom spring rates on request
- Fully rebuildable — replacement parts available from BC for the life of the shock
- 2-year manufacturer warranty against defects
Specifications
| Part Number | D-71-BR-SP |
| Part Name | BR Series Coilovers |
| Vehicle | 2002-2006 Infiniti Q45 |
| Drivetrain | RWD |
| Chassis Code | F50 |
| Damping Adjustment | 1-Way (30 levels) |
| Ride-Height Adjustable | Yes |
| Spring Rate - Front | 8 kg/mm |
| Spring Rate - Rear | 5 kg/mm |
| Spring Size - Front | 62-180-8K |
| Spring Size - Rear | 62-220-5K |
| Swift Springs - Front | 62-178-X |
| Swift Springs - Rear | 62-228-X /NA |
| Camber Plates - Front | Included |
| Camber Plates - Rear | Not Applicable |
| Suspension Design - Front | True Coilover |
| Suspension Design - Rear | True Coilover |
| Notes |
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Vehicle Fitment
- 2002 Infiniti Q45 RWD (F50)
- 2003 Infiniti Q45 RWD (F50)
- 2004 Infiniti Q45 RWD (F50)
- 2005 Infiniti Q45 RWD (F50)
- 2006 Infiniti Q45 RWD (F50)