K&N Typhoon Induction Kit - In excellent condition with nice Carbon fibre effect end cap and metal heat shield.
Was only on car for 1.5-2 years. These cost over £ 350 new. Price £ 175
Listed on Demon Tweaks for Forester 2.5 Turbo so may also fit Forester STI but you would need to check
Price does not include postage but happy to look at postage if required