Strader 3-1 expansion chamber exhaust
for Suzuki GT550 (all years)
Probably the last one left on the planet
$600 grabs it
Designed to work with stock airbox and filter. Walter Strader recommended same main jetting as stock but with all 3 jets the same size. My preference would be to jack up the needles 1/2 a clip setting (with a shim washer) see how that works, and then try a full clip setting if needed. Also one size bigger pilot jet.
Sound is louder than stock but not ridiculous. Still ok for street use. Much milder than those popcorn-pop sound race chambers.
This is how it looked on the bike I removed it from:
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