i havent used them as im building my engine, i bought a second hand engine and they were on it i would use them but i want to buy a t04z, i have sent them away before but i lost the peice of paper witht he specs, i sent them to precision turbo's in syd, they said they had steel wheels in them and had been high flowed i will send them away again and get them to give me the details of them such as HP rating, AR and some pics soon, they are in brand new conditon.