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57 reviews


RS500 Airbox [Mk2 Focus RS]

The only Ford-endorsed Mk2 Focus RS airbox upgrade - as used in the Focus RS500 and MP350 upgrade...

mountune’s involvement with the mk2 Focus RS began more than a year before the vehicle’s public debut back in 2009. From the outset it was clear that to increase the power output significantly, an improvement to the airflow capacity on the RS’ OE intake setup would be required.

mountune’s engineers set about designing a revised Focus RS airbox and inlet spout that would surpass any of these airflow requirements, whilst retaining the original look and feel you’d expect from an OE component.

Unlike other examples on the market, the mountune Focus RS airbox has been designed and tested to meet OE standards, and was also subject to extensive rig testing.

Independent testing showed up to 17% less pressure loss than the OE fit part, equating to more than enough airflow for 400PS+, as demonstrated on the now infamous mountune Focus RS MP350 and Focus RS500.

Kit contents:

  • 1x mountune improved-flow inlet spout
  • 1x mountune increased-capacity airbox upper
  • 1x mountune badge
  • Fitting instructions

Recommended to install with the mountune High Flow Air Filter.

Customer Reviews
4.9 Based on 57 Reviews
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Filter Reviews:
    GS M.
    United Kingdom United Kingdom
    RS 500 airbox

    top quality item fits and looks factory

    Fritz S.
    Germany Germany
    Very good product

    Good quality, looks nice, works and fits, love it! The only "Minus" was the long delivery time!

    United Kingdom United Kingdom
    Better use of space

    Fits the space better by increasing box size, works well with the air filter being open at one end instead of being enclosed