I have xero-limit FF kit. Seems to be the cheapest option that also includes an independent Zeitronix Ethanol% gauge. Easy install, fittings all look to be good quality. Uses the same Zeitronix sensor/eca as most the other kits. I’d either go this kit as it’s probably the cheapest high quality kit (do to buying in bulk and having cheaper labor costs in that state vs other states, not cheaper because quality) or just support whoever is tuning your car and get whatever kit they provide. In my case it happens to be both.
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