Well, perhaps I'm a bit slow.... But I cannot understan which filters is called what.

Is this the stage 1 ??
http://thumbs2.ebaystatic.com/d/l225...Z9G_CEGOSA.jpg

Is this the stage 2 ??
http://www.sgmotorshop.com/wp-conten...R-Y6E08-01.jpg

Is this the stage 3 ??
http://www.sgmotorshop.com/wp-conten...P-Y6E08-S2.jpg

What are the filters called in Kev's mod/hp thread?
http://www.xt660.com/showpost.php?p=38082&postcount=1

Waiting to get informed
Thanks!