RS-R Black-i coilovers for the 2013-2015 Lexus GS350 RWD (GRL10) are engineered from the damper piston up for one job: going low without breaking the ride. Where a normal coilover bottoms out or rides like plywood at aggressive drop heights, Black-i has revised valving, extended lower-mount travel, and spring rates matched to the lowered range. You get the slammed stance your build wants with damping that still works over real-world pavement.
Black-i is RS-R’s purpose-built extreme-drop coilover. Where a normal coilover bottoms out or rides poorly at aggressive ride heights, Black-i is engineered from the damper piston up for cars that are going low — revised internal valving, longer perch travel, and spring rates matched to the extended drop. Still 36-level damper adjustable, still rebuildable. Built for slammed daily drivers who don’t want the ride quality to fall apart at height.
Features
What’s Included
Specifications
| Part Number | XBKT170M |
| Part Name | RS-R Black-i Coilovers |
| Vehicle | 2013-2015 Lexus GS350 |
| Chassis Code | GRL10 |
| Drivetrain | RWD |
| Damping Adjustment | 36-Level Single-Knob |
| Ride-Height Adjustable | Yes |
| Damper Construction | Monotube |
| Preset Approximate Height – Front | -65mm (-2.5inch) |
| Preset Approximate Height – Rear | -80mm (-3.1inch) |
| Maximum Adjustment Range – Front | -45mm to -200mm (-1.7inch to -7.8inch) |
| Maximum Adjustment Range – Rear | -60mm to -145mm (-2.3inch to -5.7inch) |
| Recommended Adjustment Range – Front | -60mm to -80mm (-2.3inch to -3.1inch) |
| Recommended Adjustment Range – Rear | -70mm to -105mm (-2.7inch to -4.1inch) |
| Spring Rate – Front | 18.00 Kg/mm |
| Spring Rate – Rear | 10.00 Kg/mm |
| Upper Mount – Front | Rubber Bushings (OEM-style) |
| Upper Mount – Rear | Rubber Bushings (OEM-style) |
| Suspension Design – Front | True Coilover |
| Suspension Design – Rear | Divorced |
| Rebuildable | Yes |
| Warranty | 1 Year / 12,000 Miles |
| Notes | – |


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