Depends on how the car is tuned. Mine. with EGR and without EGR no difference at all. still punchy. only when the ECU detects the EGR being block then it will detune. celaka

exhaust recirculation only happens duriing low or no load. meaning if you're boosting the valve is closed and you're running fully on air and diesel. the likelihood of why you're experiencing low performance could stem from a few factor.

1. Detuned setup for 4X4. For offroad cars, you don't need aggressive immediate torque. that may cause unnesessary traction lost. In addition, they also offer low range gear to prevent too much over spin and lose traction.
2. clogged vanes.
3. ECU adaptation and self learning required.
4. PCV clogging the intake and turbo fins reducing the efficiency of drawing air.
5. plausible clogged intercooler due to oil vapor from PCV.