The SPC Performance front upper control arm set adjusts front camber and caster plus or minus 1.5 degrees on the Audi B9 platform. The forged aluminum arms use OE-style booted ball joints and bonded rubber bushings to maintain factory ride, handling and noise, vibration and harshness parameters. The multi-link front suspension creates a virtual steering axis inclination; the factory does not publish a caster specification, and SPC recommends 5 to 6 degrees of caster for tracking and return to center. For the left side use part 81381 and for the right side use part 81382.
- Type: front upper control arm set
- Adjustment: plus or minus 1.5 degrees camber and caster
- Position: front, upper
- Material: forged aluminum
- Ball joints: OE-style booted
- Bushings: bonded rubber (factory NVH)
- Related parts: 81381 (LH), 81382 (RH)
- Part number: 81383
Vehicle Applications
- 2017 Audi A4
- 2018 Audi A4
- 2019 Audi A4
- 2020 Audi A4
- 2021 Audi A4
- 2022 Audi A4
- 2023 Audi A4
- 2024 Audi A4
- 2025 Audi A4
- 2018 Audi A5
- 2019 Audi A5
- 2020 Audi A5
- 2021 Audi A5
- 2022 Audi A5
- 2023 Audi A5
- 2024 Audi A5
- 2025 Audi A5
- 2018 Audi RS5
- 2019 Audi RS5
- 2021 Audi RS5
- 2022 Audi RS5
- 2023 Audi RS5
- 2024 Audi RS5
- 2018 Audi S4
- 2019 Audi S4
- 2020 Audi S4
- 2021 Audi S4
- 2022 Audi S4
- 2023 Audi S4
- 2024 Audi S4
- 2025 Audi S4
- 2018 Audi S5
- 2019 Audi S5
- 2020 Audi S5
- 2021 Audi S5
- 2022 Audi S5
- 2023 Audi S5
- 2024 Audi S5
- 2025 Audi S5
FAQ
How much adjustment does the 81383 provide?
Plus or minus 1.5 degrees of front camber and caster.
Which vehicles does it fit?
Audi B9 platform models including the A4, A5, S4, S5 and RS5. See the Vehicle Applications list.
Are individual sides available?
Yes, part 81381 is the left arm and part 81382 is the right arm.
What caster setting is recommended?
The factory does not publish a caster spec; SPC recommends 5 to 6 degrees for tracking and return to center.
