Exhaust question....
Discussion
It's an attempt to hide the soot! Early diesels (without DPF's) chuck out a lot of soot under hard accels at low rpms (in the "smoke limited" operation zone) so by having a downward pointing pipe, this soot tends to merge better with the black coloured road, and be less obvious (except at night, when the following cars headlamps easily highlight the "haze" )
More modern diesels with 1) better cal and higher injection pressures or 2) DFP's emit just about no soot, so they now tend to have straight tailpipes
More modern diesels with 1) better cal and higher injection pressures or 2) DFP's emit just about no soot, so they now tend to have straight tailpipes
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