Ken is right and they are not paper weights as I run one that won GM Design Award as well as SEMA awards and they do not hand them out unless they do what is claimed.
Your problem is something left disconnected I would think. I'm running mine with suercharger which does not help when in boost but, when in casual driving or cruising down interstate not in boost You get benefit of better fuel/air mix and getting more bang for the gallon of gas. Not much and probably would never save enough to get money back. I do know before supercharger I added it and felt a change in low end but, it was also installed with cold air intake.
TAZ
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05 H2 SUV cus. paint, Magnuson SC 6/12lb boost, cowl hood scoop, 12" dash touchscreen, GM elec. fans, HPTuners.com tuning soft., Dynatech headers dual catback exhaust Jet Hot chrome front to back Flowmaster Super 40's, Diamo 8 Karat rims & 325X60-20" Toyo, 4 OEM Captain seats Katzkins leather, rear console computer inside running all AV/NAV etc., Infinity component system 3 amps Tsunami Caps, rear flip down 12" monitor, headrest monitors, overhead console boost, fuel pressure, & A/F ratio gauges
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