for your intake boot, (the one that goes from your engine to your carb) you can modify the stock one to fit with vf3s. as for the 33mm carb, not sure if you can modify it or not. but as for a intake, you can get a custom air box, or put a air filter on the back of your carb. thats what i am running and alot of guys on here are too. theyre good unless you are going to do alot of mud/water riding.