Yeah idle valve works perfectly well. They are awesome, I had one for a while to develop the ECU on and they were rapid things. Got to get the suspension and brakes right thought or they are awful, they have passive rear steering bushes which you may choose to solid-mount for a more traditional handling setup... lots of info out there though!
My engine builders' father runs a 285bhp 306gti in the Irish Touring Car championship and often wins races. That engine flies, so if you are interested in anything on that side drop me a note
