What is this filter? FAO Firecracker

[chris_xb12s]

Hi,
Can somebody please help me with this filter.

im interested to know if this is a DIY job or something you guys can buy in the states.
Cheers
Chris

 

[Thaloc]

http://www.buellxb.com/Buell-XB-Forum/Buell-Firebolt-XB12-XB9/Finally-My-custom-Air-Intake

 

[chris_xb12s]

exactly what i was looking for, thanks
Chris