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Discussion Starter · #1 ·
I've got a ST90 going into an GB Ultimate bipe and I need a muffler for it that'll work.

I don't know if there's a difference in with the ST 90s like there is with the 61s, , but this one has the same sized case as the 61K. The muffler bolts need to pass through the muffler and fasten to the engine.

Thanks for looking,
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