Its a Frisco thing I believe , LOL. @dl_EVO if you plan to put a 4" inlet,your filter can NOT measure no more than 4" long!! I had replaced my box with and AMSOIL filter and the thing barely fits and its a 6" long filter, there is someone in the forums that has made a mod for his X5d and cannot remember if its this forum or the other. DO NOT rig the system it might not work properly and word to the wise AVOID an OILED filter eventually your oil will run at take out the MASS FLOW sensor and void your warranty!!
RENNtech Flash(Lenny Wu)/WAGNER IC
Enkei Rajin 18"/Execuhitch Hitch/Koni FSD
Soft Ride Bike Rack/Brava Synthetic Motor Oil(Made in Puerto Rico)/Meth(in the works)/CBU done w Andrew EGR Race Pipe (whoa! what an animal it is now)