So I have read every thread under the sun about air filters for the bike and have basically decided on a BMC. I am still unsure about whether or not to use the restrictor. I just ordered a full leo and PCV and I want to install a new filter at the same time. I have read that its ok to use the filter without the restrictor if you have a full exhaust/PC but does that mean I should? I really only ride on the street, although I do see a few track days in my future. Someone please shine some light on this for me. Thanks. Also, whats the cheapest place to buy a BMC on the internet? Preferably on the east coast so I can get it in a timely fashion and not delay installing my exhaust/PC.