Fleetguard has an 8" diameter fiberglass filter (AH19002; 470 cfm) but it doesn't flow near as much as the BHAF (Fleetguard AH19037; 687 cfm). Fleetguard 1752M flows 812 cfm @ 6" water but is 7. 8 x 24" long so not real practical.
Mr. Bob's Distributing has the AFE setup and a TDR special at $199 (list is $295). I got one from him, and dyno'ed it. It made about 4 hp more than no filter or anything on the turbo at all. That's darn good and the filter is high quality for its type. I still like a paper filter in high dust, but the AFE is tempting for those seeking max hp, or in lower dust environments. If the hood is opened up like mine (homemade cowl induction), cool air will get onto it and help even more in keeping egt down.