As previously posted I had an inlet manifold replaced on the W211 but the car just wasn't the same. No instant acceleration and lower mpg. Main dealer and two Indies gave it the once over and reported everything as it should be so on Friday I got Angel Tuning to do a remap and hey presto I've got my old car back. I bought the car when it was less than 2 years old from a main dealer and the previous owners must have had it tuned up and nobody knew. So now I'm one happy chappy.