This is what might be called “extreme tuning”. This is Hsia SAAB 9-5 XT with MapTun customize ECU and engine rebuilding, MapTun Hybird Turbo Garrett GT35R A/R .70 & HKS GT3040 turbine T25 flange A/R 1.01, 1.0bar, 580~600hp.
Result is 520 Hp/537 Nm and Short time peak 560hp!
See in video
The design Process: