Basically the car is flat until roughly 3000rpm and a ton of soot behind me.....then she takes off like a banshee. I've tried the original map and exactly the same. I've physically driven the car with the MAF disconnected and it's exactly the same but I didn't push it to spool up with boost....it was dirty though before I cleaned it. I've checked all the boost pipes and any that will hold pressure for splits or signs of leakage and nothing. Both intercoolers are absolutely spotless apart from a fine film of oil which is what I would expect. With the both boost hoses off the turbo I can feel the slightest of play in the shaft and I do mean the slightest.....the turbines turn easy enough with my finger but not what I remember from a Garrett Turbo on a petrol car.....it's slightly tighter but turns easy enough. I took a short video of it when it was cold and it looks like the turbines are having trouble rotating and you can see it speeding up slowly but it's notchy. Once it was spinning freely you could hear it spinning with the slightest spooling up noise and with the slightest of touches on the accelerator it was spooling up as it should be. I've also checked the actuator with a vacuum pump and that both holds pressure with no leak and moves freely. The N75 valve at the front of the block seems to be working as if I turn the engine off and remove the top pipe it's holding pressure, but if it's not connected and I start the engine it hardly spools up. Once connected again it's fine. If I have the time I'm going to try and remove all the solenoids under the turbo and see if they are faulty and working correctly. I have a feeling it maybe the turbo is on it's way out.....but I'm hoping someone on here can verify that the VNT's are quite tight compared to the petrol variants. I too think my car is sulking as Rob said due to the BBK going on......but on a side note you only have to tap the brake pedal and you go through the screen. I'll also try and get the videos edited and upload them later if I have time as we are out at an anniversary later.