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Adapter plates to go from a 1bbl to a 2bbl on the stock intake for the 300 are difficult to find, but do exist. Your best bet is to keep your eyes open on craigslist and ebay for a used 4bbl intake and get a readily available 2bbl adapter for it. They're about $250 - $300 new, but I've seen them for down around $50 - $100 or so for used.
There ARE two barrel adapters, but they don't really offer much performance gain because the opening on the 300 stock intake is soooo restrictive. Doable though, if you can find one.
i have looked at the 4bbl manifolds, i think i like the cliffford the best as it has the coolant passages. The holley 2v is a freebie, so i was just looking to put it on until i can afford a clifford intake and hedman header.
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Slideshow: Called the Fortress, the 850-horsepower pickup combines Raptor underpinnings with military-inspired features, survival equipment, and a starting price of $285,000.