I have the Volant air system with throttle body spacer. It helps, but the big difference came with the headers, magnaflow exhaust and Jet Chip. I am estimating around 400 HP and my mileage went up alittle BUT the BIG DIFFERENCE is the throttle response and it is just plain FUN TO DRIVE now. Very Peppy and gets up a goes. My 0-60 time went down to 8.3 seconds!!!
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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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