MAC 2:1 exhaust for 1980+ GS450 - will it fit 77-79 GS400/425's?

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  • Chuck78
    Forum Sage
    Past Site Supporter
    • Aug 2012
    • 3691
    • Columbus, Ohio

    #1

    MAC 2:1 exhaust for 1980+ GS450 - will it fit 77-79 GS400/425's?

    Any idea if the 1980+ GS450 exhaust made by MAC is at all adaptable to fit the first gen GS400/425 engines? I see no aftermarket exhausts listed anywhere for the first gens. They are a totally different bore and stroke, so I assume there is a slight difference in engine height, but not sure how much different and if it has much affect on the cornering clearance or oil pan/frame clearance.

    Contemplating my next build with these and many thoughts on mods.
    '77 GS750 920cc heavily modded
    '97 Kawasaki KDX220R rugged terrain ripper!
    '99 Kawasaki KDX220R​ rebuild in progress
    '79 GS425stock
    PROJECTS:
    '77 Suzuki PE250 woods racer
    '77 GS550 740cc major mods
    '77 GS400 489cc racer build
    '76 Rickman CR1000 GS1000/1100
    '78 GS1000C/1100
  • vitaliy.grzh
    Forum Newbie
    • Jan 2026
    • 1
    • Federal Way Washington

    #2
    12 years later, but yeah they should fit, id buy a Japanese 2 into 1 or maybe a European Marving style 2 into 1, removable baffle and all
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