The stock air filters do not flow much air, I modified them by removing the metal mesh that covers one side, it restricts the flow, but even with that removed it held my motor back on the dyno to low 90's hp,
whipped filters out got over 100hp.
I do not know if anyone has done a filters only before & after dyno it would be interesting, but I have to pay for dyno time so will not use it up for this, But in my opinion reasonable size pods, I have seen some that do look a little inadequate (ever get that feeling) could yield a touch more at top end, but may lose slightly at low rpm, due to the way Triumph have cleverly designed inlet tracts (also exhaust but that is a different subject) for low down torque.
Would it be noticeable, probably not, but the intake sound from the pods may sound faster to some.
So no harm done, if you like that look go for it.