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Strengthen BMW Rear Suspension With Billet Trailing Arms
SPL Parts SPL RTR E9X replaces the flexible stamped steel rear lower trailing arms on compatible BMW E8X and E9X models. The rigid billet design reduces arm deflection and unsprung mass to improve suspension control and response without adding noise, vibration, or harshness.
Key Features
- 6061-T6 billet aluminum construction improves rigidity
- Black anodized finish provides a durable exterior
- Each arm weighs 0.75 pounds and is 35 percent lighter than the original arm
- Direct replacement design uses the included Class 10.9 metric hardware
- Reduced arm deflection helps control rear bumpsteer during acceleration and braking
Fitment
| Years | Make | Vehicle Application | Chassis | Position |
|---|---|---|---|---|
| 2008-2013 | BMW | 1 Series, including 1 Series M | E81, E82, E87, E88 | Rear lower |
| 2006-2013 | BMW | 3 Series | E90, E91, E92, E93 | Rear lower |
| 2008-2013 | BMW | M3 | E90, E92 | Rear lower |
Specifications
| Detail | Value |
|---|---|
| Manufacturer part number | SPL RTR E9X |
| Product type | Rear lower trailing arm set |
| Arm material | 6061-T6 billet aluminum |
| Finish | Black anodized |
| Hardware | Zinc plated Class 10.9 metric hardware |
| Weight | 0.75 pounds per side |
| Original equipment part numbers replaced | 33322406291 and 33326763477 |
What's Included
- Two SPL RTR E9X rear lower trailing arms
- Four Class 10.9 mounting bolts with nuts
About SPL Parts
SPL Parts develops suspension components for performance street and track vehicles. Its SPL RTR E9X trailing arms use machined billet construction to replace the flexible original stamped steel design.
FAQ
What is the SPL RTR E9X?It is a pair of billet rear lower trailing arms for the listed BMW E8X and E9X applications.
Which BMW models fit these trailing arms?They fit the verified 1 Series, 3 Series, and M3 chassis and years shown in the fitment table.
Do these arms fit BMW M models?Yes. Verified applications include the E82 1 Series M and the E90 and E92 M3.
Are the arms adjustable?No. They are direct replacement fixed length trailing arms.
How much does each arm weigh?Each arm weighs 0.75 pounds, which is 35 percent lighter than the original arm.
Will the arms add noise or harshness?No. The manufacturer states that the arms have no impact on noise, vibration, or harshness.
Is mounting hardware included?Yes. Four zinc plated Class 10.9 mounting bolts with nuts are included.
Which original BMW parts do these replace?They replace BMW trailing arm part numbers 33322406291 and 33326763477.
Installation Instructions
- Confirm the vehicle and original equipment part number match the fitment table before installing SPL RTR E9X.
- Raise and support the vehicle using the BMW service procedure.
- Remove the rear wheels and support the rear suspension before loosening the original trailing arm fasteners.
- Remove one original rear lower trailing arm and compare its mounting points with the replacement arm.
- Install the matching billet arm with the included Class 10.9 hardware.
- Repeat the procedure on the opposite side.
- Tighten all hardware to the applicable BMW service specifications at the specified suspension position.
- Inspect the installation and verify rear suspension operation before driving.
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