I had the Black tragic fan, junk..... Car ran hot and couldnt out the A/C on-otherwise-You'd sit and watch the needle climb uncontrollably. I liked the looks of the newer Flex-a-lite Extreme, Really nice shroud and all, But after having the MKVIII fan, i dont think i would ever swap for anything less. So-My vote is MKviii all the way. if mine ever dided-Than i would try the extreme. Just for reference, The Blck Tragic fan 165 stated 2200CFM, the Extreme states 3300CFM, and the MKviii on high is 4100CFM... The Dodge viper fan is 4300CFM, but you will have major shroud prob's....\
Hoep this helps, Anthony