06-06-2018, 08:01 AM
Erich on both my cars an external filter is fitted half way down the engine bay on the driver's side, just below the louvered side panel. The two fixing screws are accessible under the wheel arch. About a yard of flexible hose is called for. I prefer not to hang anything off engine studs and it keeps the hose run roughly level. This was a common layout at one time and has no obvious drawbacks, mine has run this way without trouble for yonks. Bulkhead mounting would indeed call for a bit more hose, I think it could get tricky finding a run where the hose doesn't fret against anything.