im using a cotton blue cosworth one in my uk 2000 w reg,

As others have mentioned its cheaper to purchase a uk version 5/6 y7 or e3 ecu with a valid ecutek licence CIRCA £100 and speak to a mapper about doing a remap,circa £280-£300 map,

With a decat and fuel pump for piece of mind that should give you somewhere around 270/280 hp with probably at least 300/310 lbft torque.
Made a massive difference to mine and gave me peace of mind having it mapped properly.
Bob rawle mapped my car .

 

Problem is rather not bump up the power too much with a re-map on the old engine (120K+) in case it breaks somthing. Seen this on e-bay never heard of Subaru Pro R before?

http://www.ebay.co.uk/itm/SUBARU-IMP...item3a7cd5b139

Whats the difference between that and a K&N besides price?

 

Fitted a pippercroiss foam filter. Blimy what a difference didnt realise the old paper one was so restrictive.