FWIW, my S54 has this lumpiness, spluttering and occasional kangarooing when cold. For me it seems to be the Eisenmanns as it does not do it with the factory pipes on. I put it down to the lack of back-pressure in the Eisenmanns and not getting the chimney like draw untill they are warmed up. Could be tosh, but its my theory :)
When wamr though, no issues and a sweet sweet sound!
When wamr though, no issues and a sweet sweet sound!
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