A dude on a German got the Extech, and has been disappointed(He also tried the Axe 25 and was disappointed with it too..) He's tried various pipes and plugs, and says it's just not all that - for the money.. NO, of course that shouldn't serve as a verdict. Maybe he's wrong.. But so far that's all I've heard about it.. If you've got the big bucks for the top Italian engines, the C6 would be my choice, cuz it's a safer buy for your money.. It's a known known, the Extech a known unknown.. Heh-heh....