I know this was discussed a bit on the throttle body thread, but I need some more specific advice concerning the device itself and not so much concerning the throttle body, and didn't want the hijack that thread.
Is it necessary to have it installed to pass CA smog? Mine is spotty at best, but I don't want to remove it only to fail smog.... my idle after the rig has warmed up gets up a bit and I have traced it to the crummy old dashpot.
Ideas?