Suzuki GS400 Exhaust

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  • Andy24
    • Jan 2026

    #1

    Suzuki GS400 Exhaust

    Hi, im planning to change the muffler on my Suzuki GS400 '79 she has now an aftermarket 2in1 no name on it,im looking to get a better sound,ive looked to this muffler http://www.ebay.co.uk/itm/CHROME-SHO...item5670525c42 its open but have a buffler included i think it will help to have some back pressure an not a too screamy sound (i like it a little deeper)
    have anyone experiences with short muffler like this?
    the bike have the stock air filter setup and dont want to change to open filters 'cause i ride in the rain and dont want to use too much fuel or run lean,if i change to this muffler do i need to change just the main jet(not the pilot?!)? and how much do i need to increase the size? im not sure what jets are now on the bike( i think the stock) but i can check.
    ill appreciate any help
  • steve murdoch
    Forum Guru
    Past Site Supporter
    • May 2004
    • 8491
    • St. Catharines, On.

    #2
    I don't know that muffler specifically but if you run it with the baffle i think the stock jetting and airbox will be fine.
    It could be the previous owner already rejetted for 2-1.
    2@ \'78 GS1000

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