Open source can tune gc8 as well, not ecutek exclusive feature anymore. Standalone boost controller doesn't need tuning, as long as ecu can rwad boost and load to compensate fuel and timing.

Boost tee is to set minimum boost, ie u wanna run higher than wastegate pressure. It has has no control on boost spiking/creeping

using the Perth-WRX mobile app

__________________
MY08 STI 422whp at 1.5bar on E85, built by Diversion Garage, assembled and tuned by EvoR

Update from new owner: 375whp at 1.4bar on 98, at Tokyo Motorsport