I bought a v46 for my sv and it's brilliant. Perfect for touring and commuting alike. As daddyjob says, doesn't effect filtering when on and has loads of room.
For anyone looking for one for their SV, I bought the whole package (v46 box, rack and M5 monokey plate) off ebay from a bloke in Italy
here. Brilliant service and he's happy to post to uk if you contact him for a quote. Last year he charged 25 euros for tracked delivery which took less than a week
. Well chuffed.