Pierburg make some OEM Mercedes MAFs and they are much cheaper than either Pierburg or Bosch ones supplied through the dealerships. When trying to solve the smoke problem on my S320 CDI I got one from a motor factors for under £50 + Vat ( It turned out that the original unit was OK, so I have a spare if anybody needs it!!)
I also had to replace a Bosch one on my wife's Audi TT Roadster and again used a Pierburg at similar money. The motor factors will have a fitment list with the latest part numbers for each vehicle. The original fitted to my CDI was Pierburg but the replacement data showed that the part had been superceded by a newer part number.
I am advised that the Pierburg units are much more relaible than the Bosch equivelent.
I also had to replace a Bosch one on my wife's Audi TT Roadster and again used a Pierburg at similar money. The motor factors will have a fitment list with the latest part numbers for each vehicle. The original fitted to my CDI was Pierburg but the replacement data showed that the part had been superceded by a newer part number.
I am advised that the Pierburg units are much more relaible than the Bosch equivelent.