From all the numbers and clips I've seen, the only Comp Cams that have the same choppy idle require springs and the gains seem to be very similar up top, though they lose a little down below. Now I don't know about any new grinds, this is information I gathered in December. The Comp NSR cams that Brenspeed sells do not have a noticeable difference in idle and gain 15-20 RWHP on a basic bolt-on car and lower gears are highly recommended. The problem with most of the Comp Cams and BBR is that to get the rough idle and gains, they increase the lift. That's the reason for the need for springs. The FRPP Hot Rod cams increase the exhaust/intake overlap, and lift is only increased by 1mm. So that's how you get the big block sound without having to replace the springs.