The new design Stage 2 induction kit that works perfectly with the standard Focus ST 250.
Expect to see gains of 5-10bhp compared to the original Airbox.
Enhanced induction sound, great looks and loud recirculation dumpvalve noise on let off and only £295.00
Features.
Removes ugly original plastic & restrictive airbox
Adds power and torque, 
more responsive and exciting driving experience
Enhanced induction sound and turbo recirculation noise (dumpvalve 'psssh')
free flowing Airfilter & optional k&n dry charger filter cover
CNC maf sensor boss with AS engraved logo
Powder coated alloy heat-shield with 80mm cold feed pipe which directs air to bottom of filter
Adds style to your engine bay
Easy fitting
Conclusion. It's easy to fit, looks great, sounds even better, doesn't cost the earth and can be put back to standard quickly (warranty)
 
PLEASE NOTE: Only Available in Black