I've searched and have came up with three different answers:

1. Yes
2. No
3. Yes, with some minor modifications.

Also, will the 2is F sport filter fix in the 3is air box?

Thanks.

i dont think the lower box will fit in there without modification

I don't have the lower box. The only parts I'm trying to swap over is the tube & filter.

you can put the tube in, i put the JoeZ tube from my 2IS in the 3IS

the f sport drop in filter doesn't fit though?

1. Yes if you replace the entire stock unit with a CAI with no heat shield
2. No if you only want to change the tube and drop in filter. The drop ins are different
3. Yes if you want to add a modified heat shield to go along with a CAI

Not interested in a CAI- guess I'll just reuse the tube and get a new filter.

They are the same intake.

no the box dimesions are slightly different , if you change to CAI then it's fine.