Hi Everyone, A year ago, I made the break from Citroens (my last and indeed the turning point, being a 51 plate C5). Anyway, after driving a mates A6 2.5 TDi 155 bhp, I decided a V6 diesel was for me and I proudly bought an Allroad 2.5 TDi 180 BHP with manual, Bose and the fancy twin spoke wheels. I have today replaced the nearside front suspension airbag and the brake light switch and all is well. However, what I have been noticing over the last week or so, is the lack of power up to 3000 rpm. OK, I don't expect too much up to 1500 rpm, but I used to notice a gradual increase in torque till 2000 rpm and then a little surge of torque and a slight change in engine note which would give a smooth and good response until 3000 when the turbo comes in. That increase from 1500 up to the 3000 is distinctly lacking. At 3000 the turbo comes in as always and power is as usual. Does anyone know what gives this small but noticeable surge of power around 2000 rpm? Variable valve timing? VAriable vane turbo? I've had a casual look of the vac circuit and can't see anything untoward. As an extra bit of info, on my last but one drive the car just wouldn't go above 2500 ish, foot down in 3rd or 4th but refusing to climb the revs (this was up a small incline). This reminded me of my mates Audi that used to do a similar thing when the catylitic converter failed. However, I just went out for a spin and aside from the lack of power until the turbo kicks in, it managed to climb the rev range to 4500. So, what are the symptoms of cat failure? and is it intermittent?