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65 reviews

2146-CAIS-AA

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 65 Reviews
5 ★
92% 
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4 ★
6% 
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Filter Reviews:
    IB
    16/12/2021
    Imanol B.
    Spain Spain

    Perfecto

    Todo muy bien, precios muy altos pero buen servicio

    A
    29/11/2021
    Anonymous
    United Kingdom United Kingdom

    RS 500 airbox

    I haven’t been able to get the part fitted yet as I’ve been waiting for the high flow air filter to be back in stock, which has now arrived so just need to get it fitted, I can’t comment obviously on using the car with the new parts but I’m more than happy with the look and quality of the parts, so I’m sure I’ll have a smile on my face when they’re fitted. Next step will be the mountune plenum upgrade.

    A
    31/07/2021
    Anonymous
    Australia Australia

    the web site was easy to use delivery was unbelievably quick 6 days from ordering to delivery to australia from the uk