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I was aiming for 400bhp with my P1 and used RCM400 turbo.... Expected to be running around 430-440 possibly. Spool is fantastic, so much response...
Just an option...
Been hearing good things about the rcm range and them hitting more than they say on the tin, also if you want 400bhp but don't want to spend 1500 quid plus on a new turbo I am sure there is a md321h for sale in the general section and that should see you where you want to be