Happens to me on cold starts sometimes. I'll start driving and I hear this metallic sound (must be wastegates) then turbo spool has stopped and exhaust noise is deeper and louder. Then after a couple of minutes the turbos come back on and everything normal. Guess wastegates getting stuck.....
JB4 cp-e IC AMS exhaust BMS DCI AR DP's METH
19" VMR VB3 Stoptech BBK TC KLINE VORSHLAG