The Ultimate Power Steering Solution. Prolonged rigorous, motorsport use of the car has long exposed a glaring flaw with the E9X M3: the power steering reservoir is simply undersized. The result is messy—it's not uncommon to find power steering fluid all over the factory reservoir and beyond.

Rather than completely reinventing the power steering reservoir's form factor, we give it exactly what it needs: room to expand. By threading our new reservoir onto the factory unit, you effectively add over 35mm of fluid expansion space while dressing up your engine bay. The additional headroom safeguards against messy engine compartments as intended and guarantees a consistent steering feel. Since there is enough area for the fluid to travel, there is no cavitation between air and fluid, resulting in driving confidence in the most extreme conditions.

Our reservoir is machined from a single piece of 6061-T6 aircraft-grade aluminum to eliminate the need for internal gaskets in the reservoir itself and the need for servicing over time. On the outside, you'll find subtle design details that add visual balance and provide a valuable grip area for installation.

Product Details:

  • Compatible with E9X M3 and E82 1M (complete application list below)
  • Adds over 35mm of fluid expansion area to the reservoir for better steering feel in any driving condition
  • CNC precision machined from 6061-T6 aerospace aluminum
  • Set includes both expansion reservoir and Hard Coat Black cap
  • Four anodizing options: Ferrari Red, Royal Blue, Hard Coat Clear, & Hard Coat Black
  • Proudly made in the USA
  • Optional Add-On: Color-matched billet aluminum cap

Application List:

  • E87 LCI / E88 1-Series
  • E82 1M
  • E9X 3-Series, M3 (without active steering)
  • E83 X3 (without active steering)
  • E84 X1 (without active steering)