May as well throw a manual boost controller on it....The good thing about this mod is it doesn't change things enough to piss off the computer so you can get away with it.
If the boost isn't doing what the computer expects the problem with be that mod...All the wastegate tables are based on many things, one of them being the spring in the wastegate diaphragm.
The wastegate preload is NOT the reason boost is low at low RPM...In fact with the SHO engine, boost is higher at low RPM than most engines out there except maybe diesels which don't count.
Whether you put this mod on or not it WON"T change the commanded boost. It will only force a change that the ECU is NOT expecting and if too far out of what's expected than a friendly DTC or CEL will let you know.
You could just ask for the commanded boost properly in the tune rather than risk the other scenario. The stock wastegates are not a problem
You want more low end boost, dial it in if the calibrator knows how...18-20 psi is easy by 2500 RPM but watch out for LSPI(low speed pre-ignition)
