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When in doubt, writing is on top. I just made that up. Don’t think there is a difference. If the EV is new to you, then check the air box cover. Two years ago , I decided to drill 1”” holes so more air could enter. The sound would make a Harley owner with straight pipes cry uncle. I had to replasticize the lid, it was that loud thru my earplugs.
Put the dirty side down. Isn't one side dirtier? That would be road grime unless it's new. My airbox has 2 2 1/2 inch holes in it, intake roar is almost the same as exhaust. It gets loud in the airbox, pods or K&N's are quieter.
Thought everyone dumped the canister to clear the transmission drain plug.I am told the canister makes the exhaust much quieter. I like long rides and wish to have as little engine noise as possible.
Are you running the stock mufflers after the canister?