you can run any carb you want with it, i use a 34mm pj and its awesome. right out of teh box i say the rad valve is geared directly towards low end gain but if you get the ole dremmel out and open it up ive had great results all thru the RPM range.
they changed the style a few times i belive because mine is different than battbikes but i think you are confused by the pics you see on ebay, those are for dirt bikes a blaster rad valve dosent look like that unless they changed again. ive used a dremmeled out stock intake boot before and now i have a regulat 34mm intake. both work great.
I see it says it comes with intake boot so I guess ill have to call them and see. Or go with the VF3 and buy a intake too. I cant decide. Oh well. dammit