BAT sells the MAF adapter you need and the big 8 or 9" K&N to go with it can be purchased at Ramchargers. I paid about $35.00-$40.00 for the MAF adapter and another $45.00 for the 9" K&N, which BTW is the largest size filter you can put on the Tour when putting it in the original location. The only thing you gotta do is remove that little duct in the fenderwell to achieve the fitment of the 9" K&N
Good luck!
