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when toggle format what by license comment
Nov 9, 2018 at 12:51 comment added Pᴀᴜʟsᴛᴇʀ2 You can directly relate "upstream" and "downstream" to their position in relationship to the catalytic converter. Upstream=before; downstream=after.
Nov 8, 2018 at 23:38 history edited Zaid CC BY-SA 4.0
added 125 characters in body
Nov 8, 2018 at 23:14 history answered Zaid CC BY-SA 4.0