Is it true these have Variable Vane Turbos ? Forgive me for my ignorance but what are symptoms if overboosting ? I was reading the sticky about common fixes and was interested in the write up about cleaning VNT through EGR exhaust outlet. I noticed the other night during a cold spell after the car was warm that the revs at above 2800 rpm ever so slight delay/sticking when I revved the car whilst idling, or dipping the clutch when driving.Also I sometimes think there's a delay on boost compared to my friends 5 spd identical sport or is it just that the 6spd ratios/gears are taller hence the torque not coming in low down as vicious as hers lol? Or could thus be linked to the Turbo ? Also I do sometimes here the Dump valve (though this is standard no after market mods) throaty noise from turbo after changing gear, is that the actuator ? Or dump valve? Is this noise normal ? Note my vehicle still pulls like a train and will still spin in second gear when 2500 rpm with my foot applied whilst running through the gearsAny thoughts anyone ? Am I experiencing overboosting as a result of the Vanes sticking ?