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Flowtech 11150FLT Long Tube Header

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Flowtech 11150FLT Long Tube Header
Flowtech Exhaust

|

#42511150FLT

Flowtech 11150FLT Long Tube Header

$297.95

/set

Factory Shipped

$331.95

Save $34.00


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Product Summary

Long Tube Header Tube Type, Standard Flange Style

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    Key Specs

    MFG. Part #11150FLT
    Header Tube TypeLong Tube
    Exhaust Port ShapeRectangle
    Flange StyleStandard
    Primary Tube Diameter1-3/4"
    See more specs

    Need To Know

    Need help?

    855.313.9176
    View the Help Center

    Quick and Easy Returns

    Return Policy

    Flowtech Exhaust 11150FLT Details

    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

    Application

    1968 Oldsmobile 442
    1968 Oldsmobile Cutlass
    1969 Oldsmobile 442
    1969 Oldsmobile Cutlass
    1970 Oldsmobile 442
    1970 Oldsmobile Cutlass
    1971 Oldsmobile Cutlass
    1972 Oldsmobile Cutlass
    1973 Oldsmobile Cutlass
    1974 Oldsmobile Cutlass
    1975 Oldsmobile Cutlass
    1975 Oldsmobile Cutlass Salon
    1976 Oldsmobile Cutlass
    1976 Oldsmobile Cutlass Salon
    1976 Oldsmobile Cutlass Tiara
    1977 Oldsmobile Cutlass
    1977 Oldsmobile Cutlass Salon
    1977 Pontiac Firebird
    1978 Pontiac Firebird
    1979 Pontiac Firebird

    Charts

    Rebates

    Holley October Promo 10% Off Select Parts Sale

    Holley October Promo 10% Off Select Parts SaleHolleyOctoberPromo10%OffSelectPartsSale

    Holley's October Promo 10% Off Select Parts Sale, running from September 28, 2026, through November 1, 2026. For a limited time, customers can save up to 10% off on select Holley parts, making it the perfect opportunity to upgrade your ride with premium Holley branded parts including Holley, Brawler, Quick Fuel, Leg Wheels, Rev Wheels, Rocket Racing, Flowtech, Edge, Racequip, Apr and Dinan. Purchases must be made between September 28, 2026, through November 1, 2026. This limited-time offer applies to qualifying Holley branded parts purchased during the promotional period. Following the promotion, these parts will revert back to standard pricing.

    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.
    CARB warning

    Flowtech Exhaust 11150FLT Specifications

    KEY SPECS
    MFG. Part #11150FLT
    BrandFlowtech Exhaust
    Header Tube TypeLong Tube
    Exhaust Port ShapeRectangle
    Flange StyleStandard
    Primary Tube Diameter1-3/4"
    Material TypeSteel
    ColorBlack
    Weld-UpNo
    Collector Diameter3 Inch
    FinishPainted
    Hardware IncludedYes
    Gasket(s) IncludedYes
    GENERAL
    Sold in QuantityEach
    GTIN Code787480111500
    NotesHeader reducers included
    Flange Thickness0.315"
    Port Height1.75"
    Port Width1.2"
    Emission Code3
    Gaskets IncludedYes
    Bolts Studs IncludedYes

    Ratings & Reviews

    5

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    Quality Product

    5.0

    7 years ago

    The Castaway Cutlass

    Idaho

    Verified

    Just like most long tube headers, they need some massaging to get in a 71 Cutlass but they are awesome, and really helped my engine breath

    Would Recommend

    Showing 1 of 1 reviews

    Questions & Answers

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    Fitment

    • Oldsmobile 403

    • Oldsmobile 400

    • Oldsmobile 403

    • Oldsmobile 403

    • Oldsmobile 400

    • Oldsmobile 403

    • Oldsmobile 403

    • Oldsmobile 403

    • Oldsmobile 403

    • Oldsmobile 400

    • Oldsmobile 403

    • Oldsmobile 400

    Customer Impersonation Script