[JeremyR]

i've got a hks ssqv. ran it vta for about a year. car would run super rich between shifts. got a recirc fitting and tied it to dump back between the maf and turbo. no more rich condition.

better to be safe than sorry.
and with something you invest alot of moeny and time into, it only makes sense to try and protect it. seriously. if it wasnt needed, than they wouldnt of came with them from the factory.