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Just fitted one this morning to my STi 8. Blimmey, what a difference it makes. It seems to pull alot smoother for one thing, but what you really notice is the noise from the dump valve. You get a really more pronounced "Whoosh" when you change gear. Not a Renault 5 boy racer bosch type whoosh, but really more audible and satisfying. I would reccomend them.
I got mine from Badger 5, £48.00, bargain. http://www.badger5.co.uk/