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Hello, You have 2 narrow band sensors upstream of your catalytic converter and 2 narrow band sensors downstream of your catalytic converter. We suggest the Quad Digial EFIE. You want the Revolution kit with full enhancement. It is perfect for your size engine. With that would come the Quad digital EFIE, which is what you need for your 2002 Chevy Suburban truck, or you could choose to go with a Volo performance chip. You can see the parts on the Revolution Hydrogen Generator kit webpage. What you won't see is also a dryer, that comes with the kit. It goes in between the bubbler and air intake. Thanks

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