lol yer when i bought my gtr it had that vooming noise, sounds similar to a formula one haha and the problem was my clutch fan, mine was spinning aswell but as soon as i changed it the rb noise was back so yer it was my clutch fan at the end, they are not expensive mate, i got mine for $60 installed but was from a mate, maybe ur luckier, good luck champ,
cheers tony