Ford Focus, 1.8Tdi. 79k miles on it.
I have a (currently) faint whine which does not appear to be engine related and is instead speed related. Comes in strongly if I'm naughty and get up to about 75mph. If I run the same engine revs in 4th the noise goes away. The front wheel bearings have no apparant play and feel OK, there is no noise or clicking from the CV joints on full lock. Could it be the intermediate bearing on the offside driveshaft? I've had a cursory push and tug and noting appears to be loose but I've not yet jacked up and dropped it on some stands for a proper look.
It's also getting ready for a new rear exhaust section. Any recommendations for good suppliers for parts? I suspect with a Ford the OE will be a single section - can anyone confirm if I'll have to weld something?
TIA