Product Summary

351C, Boss 351, Full-length Header Tube Type, Painted

    Key Specs

    MFG. Part #12118FLT
    BrandFlowtech Exhaust
    Header Tube TypeFull-length
    Material TypeSteel

    Need To Know

    This Product Will Ship Free

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    Return Policy


    Flowtech headers are the perfect combination of performance and value. Flowtech long tube headers are precision engineered using mandrel bent tubing, formed collectors and 5/16" flanges with sealing rings for a leak-free seal. All mounting hardware and gaskets are included for a simple installation. This header is coated in a high heat resistant black paint for a stealthy appearance.

    • Fuel Economy From The Engine
    • Leak Test For Max Performance
    • Mandrel-Formed Power Plenum
    • Leakproof O-Ringed Port Seals
    • Include All Mounting Hardware
    • Constructed of .049 cold roll flash mild steel tubing
    • Precision engineered for fit, performance and economy
    • Not verified to fit manual transmissions
    • Will not fit C6 transmissions


    1970 Ford Fairlane
    1970 Ford Mustang
    1970 Ford Ranchero
    1970 Ford Torino
    1970 Mercury Cougar
    1970 Mercury Cyclone
    1970 Mercury Montego
    1971 Ford Mustang
    1971 Ford Ranchero
    1971 Ford Torino
    1971 Mercury Cougar
    1971 Mercury Cyclone
    1971 Mercury Montego
    1972 Ford Gran Torino
    1972 Ford Mustang
    1972 Ford Ranchero
    1972 Ford Torino
    1972 Mercury Cougar
    1972 Mercury Montego
    1973 Ford Gran Torino
    1973 Ford Mustang
    1973 Ford Ranchero
    1973 Ford Torino
    1973 Mercury Cougar
    1973 Mercury Montego
    1974 Ford Gran Torino
    1974 Ford Torino
    1974 Mercury Cougar
    1974 Mercury Montego


    CARB Warning

    For race/ off road use only

    Emissions warning: this part only legal for sale or use in California for racing (competition) vehicles which may never be used, registered, or licensed for use upon a public highway. Any other use renders the vehicle tampered and not legal for use on California public highways (any public street or roadway, public dirt road, public park, or publicly maintained right of way open to the use of the public for vehicular travel). Violations subject to $37,500 penalty per violation per vehicle, revocation of registration, loss of use on California public right of ways, and proof of correction for tampering. There are similar restrictions and penalties under federal law and the laws of all other states with penalties under federal law of up to approximately $45,268 per tampered vehicle and/or engine.


    MFG. Part #12118FLT
    BrandFlowtech Exhaust
    Header Tube TypeFull-length
    Material TypeSteel
    Flange StyleStandard
    Primary Tube Diameter1-3/4"
    Exhaust Port ShapeRound
    Collector Diameter3 Inch
    Hardware IncludedYes
    Gasket(s) IncludedYes
    Sold in QuantityPair
    Emission Code3
    GTIN Code090127588789
    Collector Attachment Type3-bolt flange
    Collector Reducers IncludedYes
    Collector Reducer Exit Diameter2.5"