im thinking/planning on getting a used z7 kit from a member, but im still awaiting a reponse from him based on the T66 turbo thats included in teh kit. he said thers a tiny bit of shaft play, as well as saying its normal when running a turbo. again im still waiting on a more indepth description such as if the fins are rubbing the compressor housing, whetehr the fins move in/out(back/forth), and whether the fins wiggle from side to side.