I switched from a SCJ iron with a 830cfm annular to a Torker II with a 950HP. On the dyno the Torker II made significantly more power above 3800 RPM (20-25lb-ft on average). In the car it feels a bit more sluggish but pulls hard to 6K. I haven't tried the 830 annular on the Torker II. I should do that. I might stick with the dual plane, but it's an easy swap and the Torker II's are pretty reasonable right now.