The one that goes in the fender is supposed to make sure you get "cooler" air. I have dynoed my car with both intakes and seen 0% change in HP. Honestly I would save my money for something else, unless you just like the looks better.
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SC Motorsports
11801 State Road 52
Hudson, FL 34669-3092
(727) 856-8768
FordSpeed Racing
11733 66th St., Unit 123
Largo, FL 33773
(727) 549-8255
Dynojet Chassis Dyno