I believe off the shelve doubles are for the masses! If you can afford the others, great ! I beleive this to be the way it is. I also believe they work to some degree!!! but not like the others, I have stranges on my vette, and konis on the camaro! good post bjuice! I would also like to talk to you bj some time about the vettes!!!!! david, ( and by the way whats with the sub names next to your name, when you post? ) like expert builder, etc....?