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Discussion Starter · #1 ·
on the bottom plenum, theres letters on it, what do they mean? on the left side it says ml1 and on the right it says mr1

now i bought an additional plenum to have ported, but on this one it says ml2......mr2, the one i have on now is from a 6 speed manual, and the one i bought i believe its from a tiptronic
 

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It could be that they use a multi-cavity mold to cast these parts... that is each "casting" produces more than one of the plenums. If so, these numbers could simply be to identify which cavity the parts was from. Common manufacturing practice.
 
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