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Yoshi Pipe on WR426?

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Does anyone here run the Yoshi slip-on or complete system? Is it worth the $$$? Secondly, after I drained the break in oil, the stuff looked almoist gray. Is that normal? Thanks in Advance

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Dark gray/ brown is normal. Black is to rich and Gray is to lean. You may want to rejet to eliminate the lean spot. :)

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No matter if it is the first oil change or type of oil it should make no difference. The exhaust color will be set by the combustion fuel/air ratio for the most part.

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