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    Muffler (Stainless Steel) 40 Series - Offset/Offset (2-1/4" I/O) Fits 1938-93 Fleetwood+ 22 other models

    Retail Price $104.95 You Save $9.96
    OPGI Price$94.99
    Part# FM80424
    Mfg# 8042443
    Arriving Soon
    Please Call 1‑800‑243‑8355

    Premium stainless steel mufflers.

    Features a 10-year warranty.

    Flowmaster mufflers are now manufactured using heavy-gauge 409S stainless steel for the ultimate in strength and durability. Using the same attention to detail that Flowmaster gives all of their products, these mufflers are designed to produce the signature sound you desire from your muscle car exhaust. All mufflers are finished in a durable black paint and available in your choice of 40-series or Super 44-series. Mufflers feature a variety of inlet and outlet sizes and include a 10-year limited warranty.

    • I = inlet, O = outlet.
    • These high-performance items are not eligible for any further discounts or promotional pricing.
    • High Performance, designed to improve performance.
    • Find in OPGI's 2019 Late Fleetwood Catalog page 229.
    California Prop 65 Icon WARNING: This product can expose you to chemicals including lead, sulfur, nickel, chromium, vanadium, titanium, polyvinyl chloride, and 4,4’-methylenebis (2-chloroaniline), which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov.

    Vehicle Fitment

    Make & ModelYear RangeApplication Details
    Buick Grand National1978-1987 2-1/4" I/O
    Buick Regal1978-1987 2-1/4" I/O
    Buick Riviera1963-1976 2-1/4" I/O
    Buick Skylark1961-1972 2-1/4" I/O
    Buick T-Type1978-1987 2-1/4" I/O
    Cadillac 60 Special1938-1993 (2-1/4" I/O)
    Cadillac DeVille1938-1993 (2-1/4" I/O)
    Cadillac Eldorado1938-1993 (2-1/4" I/O)
    Cadillac Fleetwood1938-1993 (2-1/4" I/O)
    Cadillac Series 60/61/631938-1993 (2-1/4" I/O)
    Cadillac Series 62/65/Calais1938-1993 (2-1/4" I/O)
    Cadillac Series 67/70/72/751938-1993 (2-1/4" I/O)
    Chevrolet Chevelle1964-1977 2-1/4" I/O
    Chevrolet El Camino1964-1977 2-1/4" I/O
    Chevrolet El Camino1978-1988 2-1/4" I/O
    Chevrolet Malibu1978-1988 2-1/4" I/O
    Chevrolet Monte Carlo1970-1977 2-1/4" I/O
    Chevrolet Monte Carlo1978-1988 2-1/4" I/O
    Oldsmobile Cutlass/4421961-1977 2-1/4" I/O
    Pontiac Bonneville1959-1977 2-1/4" I/O
    Pontiac Catalina1959-1977 2-1/4" I/O
    Pontiac Grand Prix1959-1977 2-1/4" I/O
    Pontiac GTO1964-1973 2-1/4" I/O
    Pontiac LeMans1964-1973 2-1/4" I/O
    Pontiac Tempest1964-1973 2-1/4" I/O

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