Will only Fit with RS Spec Intercooler due to the 2.5 inch pipes will not fit the 2″ ST Intercooler pipes.The reason behind upgrading to 2.5″ Boost pipe kit is to remove restrictions caused by the 2″ Intercooler pipes & 2″ Intercooler outlets found on all ST Intercoolers standard or Aftermarket’Please don’t waste money on so called Big Boost pipe kit for your ST which have to downgrade to 2″ it makes no sense and will not give you any real gains.Our 2.5″ Hard pipe upgrade removes fords 2.0″ restrictive boost pipes. We saw gains of 11.8 bhp & 9 lb/ft torque increase’s over the standard ford pipes, these gains were achieved by simply bolting on the big AS 2.5″ Boost pipe kit!This kit is designed for BIG BHPFocus ST’s and will work best on 300bhpand over, was tested on our 364bhp ST demo car.

All Pipe’s haveswayed ends to stop the pipes blowing off on BIG BHP Focus ST’s.

Fitting takes 1 – 2 hours.

‘Please Note this kit is Slightly different to RS Big Boost kit due to ST turbo housing is different’