I have to say it sound epic, like a C63 AMG Mercedes, but subdued on the motorway.
It could be the lambda or the MAF I guess, just wondered if anyone else had a similar issue when carrying out a significant exhaust mod. I guess it'll become a process of elimination.
Does anyone know the manufacturer & correct part numbers for these 2 items (2001 4.4 S1). I'll give the ECU some miles to see if it relearns, but I suspect I'll have to start replacement these instruments one at a time. I wondered if it was something that might benefit from resetting the ECU, if I can find how to do that on a BMW forum.
