I was reading about this on they Regelin web site and wonder if this could be the problem with my boost cutting at times from 3 to 3.5 ? Any thoughts.
Forge Upgraded Wastegate Actuator
Unfortunately, the Z20LET chargers are delivered with a very weak wastegate actuator from stock. Additionally, their springs become more and more weak during lifetime. Boost-breakdown is the result - especially at tuned engines.