Its a recirculating waste so no, there is no wastgate as such but it still discharges the pressure so it is possible to hear slightly. As for the whistling noise its possibly a boost leak somewhere in the pipework - check the intercooler hasn't been damaged by a stone and that all the pipework is secure. many thanks I will get them checked out, regarding the other noise it is very noticeable as i said when my foot is lifted. Thinking back it only started happening when I drove from Ireland to Spain last year. what about MAF sensors and egr valves would they be a cause?