I have a 01 A6 2.7T and have been having a bunch of problems as of late. I had to replace torque converter, Cat, 2 o2 sensors, water pump,ECT sensor(which i actually got Audi to pay for- 10yr/ 100k miles) So, after speaking with dealer he mentioned that my car whistles for like 30 seconds and it is the secondary air pump. Is this something I should replace right away? Any suggestions to fix it?

Thanks,

Glenn