I did the same upgrade + a throttle body spacer. I had it put on a dyno and I was at 403HP. I think the programming is off. Have them redo the programming and WATCH them. I agree, make sure the parts were actually installed. My upgrades made a HUGE difference from 1500 - 4500 RPM. I could not tow my boat up a certain hill leaving Primm, NV at more than 37 MPH - After the mods, I can get up to 63 MPH - same boat, same hill....different H2.
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Yellow \'03 H2 - ProComp Mud Terrains, Black-out kit, Magnaflow Exhaust, Shorty Headers, Volant Air Intake, Throttle Body Spacer, Jet Perofrmance Chip, WARN 9000ti Winch = 403 HP
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