Product Details
RS-R Best-i Active coilovers for the 2015+ Lexus RC300 F Sport RWD (GSC10) are built for a very specific problem: replacing a factory-adaptive damper without losing the factory controller. Best-i Active keeps the OEM AVS/DDS signal, Ti2000 springs, pillowball uppers, and the full 36-level damper range, all controlled through the car’s original driving-mode button. No warning-light canceler required, no loss of factory modes — you get a proper dropped stance and adjustable damping while the dashboard still behaves like stock.
Best-i Active is RS-R’s flagship coilover for factory-active suspension cars — the only aftermarket coilover family that retains the OEM AVS/DDS adaptive damper controller while still delivering a full ride-height drop and 36-level damping. It uses Ti2000 springs, pillowball upper mounts, and a monotube damper body that bolts into the factory harness without a warning-light canceler. If you drive a GS F-Sport, GT-R, IS F-Sport, or similar AVS-equipped chassis, this is the only coilover that keeps the factory driving-mode logic intact.
Features
- Factory AVS / DDS compatible — no warning-light canceler needed
- Ti2000 springs for reduced unsprung weight
- Pillowball-bushing upper mounts (spherical bearing, no camber adjustment)
- 36-level single-knob damping through factory controller
- Monotube, hand-assembled in Japan
- Rebuildable / serviceable dampers
- 1-Year / 12,000-mile RS-R warranty
What’s Included
- Full coilover set (front and rear)
- Hex and allen wrenches
- Upper rubber seat for rear
- Hex nut, bolt and washer for rear shock
- Waterproof rubber damper cover
- Spring tubes for front and rear
Specifications
| Part Number | XLIT104MA |
| Part Name | RS-R Best-i Active Coilovers |
| Vehicle | 2015+ Lexus RC300 F Sport |
| Chassis Code | GSC10 |
| Drivetrain | RWD |
| Damping Adjustment | 36-Level Single-Knob |
| Ride-Height Adjustable | Yes |
| Damper Construction | Monotube |
| Preset Approximate Height - Front | -30mm to -35mm (-1.2in to -1.4in) |
| Preset Approximate Height - Rear | -20mm to -25mm (-0.8in to -1.0in) |
| Maximum Adjustment Range - Front | +15mm to -105mm (+0.6in to -4.2in) |
| Maximum Adjustment Range - Rear | 0mm to -55mm (0in to -2.2in) |
| Recommended Adjustment Range - Front | -5mm to -55mm (-0.2in to -2.2in) |
| Recommended Adjustment Range - Rear | 0mm to -55mm (0in to -2.2in) |
| Spring Rate - Front | 9.00 Kg/mm |
| Spring Rate - Rear | 9.00 Kg/mm |
| Upper Mount - Front | Pillowball Bushings (Spherical Bearing, no camber adjustment) |
| Upper Mount - Rear | Pillowball Bushings |
| Suspension Design - Front | True Coilover |
| Suspension Design - Rear | Divorced |
| Rebuildable | Yes |
| Warranty | 1 Year / 12,000 Miles |
Vehicle Fitment
- 2015 Lexus RC300 F Sport RWD (GSC10)
- 2016 Lexus RC300 F Sport RWD (GSC10)
- 2017 Lexus RC300 F Sport RWD (GSC10)
- 2018 Lexus RC300 F Sport RWD (GSC10)
- 2019 Lexus RC300 F Sport RWD (GSC10)
- 2020 Lexus RC300 F Sport RWD (GSC10)
- 2021 Lexus RC300 F Sport RWD (GSC10)
- 2022 Lexus RC300 F Sport RWD (GSC10)
- 2023 Lexus RC300 F Sport RWD (GSC10)
- 2024 Lexus RC300 F Sport RWD (GSC10)
- 2025 Lexus RC300 F Sport RWD (GSC10)
- 2026 Lexus RC300 F Sport RWD (GSC10)