I have just bought my xr6turbo ute manual 2007 93000kms, Its seem to had a few problems so far my main concern now is this noise coming from either the engine or turbo its like a ratteling noise I here when it builds boost to about 3500rpm and it gets louder and louder untill it cuts me off at usually 5000rpm like im hitting the limiter its like the engine diagnoses itself and cuts of the supply to the engine and kicks back like its hitting the rev limiter but 5000rpm is surely to low for that to be the limiter, then idles like its starving of fuel, or oil until I accelerate it it fixes itself usually after this happens the orange engine light comes on? Ive had a mate look at it whos not a licenced mechanic but know abit he reckons its "pinging" or "detonating" im not sure but he said it could be due to running unleaded 91 What do you guys think? Im honestly boarderline giving it back I did get 1 year warranty but no 3 month stat so anything the warrenty doesnt cover im out of pocket! Please help!