Product Summary

Universal Fit, Cast Iron, Natural, 8 Emission Code

    Key Specs

    MFG. Part #11730FLT
    BrandFlowtech Exhaust

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    These Flowtech cast iron exhaust manifolds have a 2.25 inch outlet, natural cast finish and are designed to hug close to the engine block so they fit into a wide variety of replacement and engine-swap applications at a budget friendly price. Being cast iron means they will provide years of leak-free performance with less under hood noise than traditional headers. Plus, their shorty design means you can route exhaust tubing close to your frame/floor pan for maximum ground clearance.


    • Intended for GM LS engine swap applications where durability and leak-free sealing is desired at a budget-oriented price
    • 304 stainless steel mating flanges included (mating flange fasteners are not included)
    • 2.25 inch outlet diameter offers improved flow for maximum performance from a cast iron exhaust manifold
    • 2 bolt exit flange configuration matches the E-rod exhaust manifolds for a factory like fitment. This allows the use of OE gaskets and fasteners if desired, for an OE quality seal and fitment to emissions devices
    • Cast from Hi-Silicon-Moly Ductile Iron to provide durability and corrosion resistance
    • Tight tuck design provides universal fit for most popular chassis and a clean traditional muscle car appearance
    • Available in plain as-cast finish or with black or silver ceramic coatings for reduced engine compartment temps and improved corrosion resistance


    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 #11730FLT
    BrandFlowtech Exhaust
    Material TypeCast Iron
    Collector Diameter2-1/4 Inch
    Gasket(s) IncludedNo
    Sold in QuantityPair
    Emission Code8