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you wont get 440hp out of one, i had about 375 out of mine, its currently at 360 on lower boost. as said above they are old units and pretty laggy, pretty certain simon JGM said to me once most he has seen is 400hp. i am upgrading mine for a billet turbo in a couple of months.
much better turbos out there for the money (take that advice from someone who has one!)
I got the highest figures Simon had ever seen on one of these, this was on a forged 2.5 Harvey headers and up-pipe, spec C inlet and Syvecs with 650 injectors and Hybrid FMIC.