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From what I've read, on a standard engine, not alot. Not much more, if any gain in bhp. Maybe abit more driveability, raised rev limiter and could possily run smoother.
A JMS/Rstuner map and matched inlets were the 2 most noticable gains I had for my Cup, its not the power that makes it feel quick its the torque. Well worth the money unless you plan on going further with Itb's/Jms RS-2/turbo/supercharger which then i'd just get saving for that.