I tried to use Free Spirits high flow kit with the tube, etc on my Bobber. I will tell you that they are expensive as ****, fit like crap and totally unsafe as your knees hit the filters and your feet get pushed out and cant properly use the shifter or rear brake. I sent everything back except the filters (they were jerks on refunding my stuff - never doing business with them), but here is a pic of how ended up using only the filters on the throttle bodies. All I had to do was trim some of the stock airbox. I think it looks pretty good.