AIRTEC 2.5 Inch Big Boost Pipes with 70mm Cold Side ATMSFO55 – MK2 Ford Focus RS & ST



SKU: ATMSFO55 Categories: , , , , , Tags: , , , , , , Brand: AIRTEC Motorsport


AIRTEC 2.5 Inch Big Boost Pipes with 70mm Cold Side ATMSFO55 – MK2 Ford Focus RS & ST

The 2.5″ big boost pipe kit is a must for all remapped RSs. Everything you need is included in the kit.



  • Hot side (turbo to intercooler) is made from 2.5″ light-weight alloy and connected with 5 ply silicone hose joiners.
  • NEW! Now comes with 70mm cold side hose to fit standard size throttle body expanding up to 70mm

Please Note: This is a Symposer Delete Item


Will fit with the following intercoolers:

  • Pace
  • Pro-Alloy
  • Forge
  • Ford OEM
  • Direct replacement! No modding required.

AIRTEC’s 2.5″ hard pipe upgrade removes Ford’s 2.0″ restrictive boost pipes. They saw gains of 11.8 bhp & 9 lb/ft torque increases over the standard Ford pipes and these gains were achieved by simply bolting on the kit.

This kit is designed for BIG BHP Focus RS’ and will work best on 375bhp and over.

All pipes have swaged ends to stop the pipes blowing off on BIG BHP Focus RS’.

Please Note: Pipework is now only available in Pro Series Black finish, not the silver shown in pics


Choose from options throttle body size:
Standard Throttle Body (63mm)
Uprated Throttle Body (70mm)


Fitting takes 1 – 2 hours.


Please note: For Focus ST 225 – MUST Be fitted with 2.5″ outlets on intercooler. Stock ST is 2″.
Will NOT fit Focus ST Stage 1/2 intercooler. WILL fit focus ST Stage 3 intercooler.



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Additional information

Hose Colour

Bright Yellow, Frozen White, Gloss Black, Grey, Kawasaki Green, Orange, Performance Blue, Purple, Race Red, Ultimate Green

Throttle Body Size

Standard Throttle Body 63mm, Uprated Throttle Body 70mm

Vehicle Option