SPL Rear Mid Links (RML) replace the stock spring bucket arms to offer complete control over rear toe, rear spring rate, and ride height. The threaded spring perch accepts common 60mm ID springs and allows corner weighting with fine adjustment of ride height. The upper spring perch also has a linear adjustment range to match the spring location and reduce misalignment.
We recommend pairing our midlinks with our eccentric lockout kit (ELT Z33) to eliminate the stock eccentric bolt, which can slip under significant load and ruin your alignment, leading to aggressive tire wear and poor handling in most cases. This also prevents the need to re-align the upper spring seat every time the eccentric is adjusted.
Does not include springs.
Benefits
- Large Range of Toe Adjustment
- Lightweight: 4.828 lbs (2.19 kg) per Side with Upper Perches
- Quickly Change Rear Spring Rates
- Adjust Rear Ride Height
- Less Rear Toe Change from Bushing Deflection
- Maintenance-Free, US Made, PTFE-Lined FK Bearings
Materials
- 6061-T6 Aluminum Arm Body
- 6061-T6 Aluminum Spacers & Spring Alignment Pucks
- 4130 Chromoly Steel Double Adjuster
- 304 Stainless Steel Spring Seats
- Ti-6Al-4V Titanium Hardware (Anodized Blue)
- Swift 60mm Spring Thrust Washers
Noise, Vibration, and Harshness (NVH)
The SPL rear mid links are not a significant contributor to NVH. Nissan/Infiniti also use a spherical bushing on some of the spring bucket arm variations for the Z33/V35.
Sold as a pair. One pair per vehicle.
Confirmed Applications
2003 - 2008 Nissan 350Z (Z33)
2003 - 2006 Infiniti G35 Sedan (V35)
2003 - 2007 Infiniti G35 Coupe (V35)
Replaces OEM Part Numbers
This is a list of known OEM part numbers. OEMs constantly make changes to part numbers due to part updates, suppliers, etc so this may not be a complete list.
Nissan
551B0-AL500
551B0-AL510
551B0-JK010
SPRING REQUIREMENTS
60mm ID Springs
Our midlinks must be used with a suitable 60mm ID coilover spring from Swift, Eibach, or another quality manufacturer that is calibrated to the unique motion ratio. Use our midlink spring calculator to find out which spring best fits your needs and setup.
Failure to use the proper spring can result in part failure, bad handling, dangerous driving characteristics, injury, or worse. Please email us if you need guidance.
SPL is not responsible for incorrect or ill-advised spring choice.
FITMENT WARNING
Infiniti Active Steer
Does NOT fit 4-wheel steering (4WS, aka "Active Steer") equipped Infinitis
Install Instructions
SPL RML Z33 Midlink Instructions
Maintenance Parts
