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They are failure prone and can be very expensive to repair as in labor hours and parts cost. EGR heat exchanges on ford are very well known for cracking then causing some exhaust and coolant to swap places.
One person I work with has a 2011 Cummins and is claiming that an egr and dpf delete, different injector timing and bigger straight pipe exhaust took him from 17mpg to 25mpg on his 35 mile drive to and from work every day.
There are also plenty of tails of 2007.5 trucks doubling fuel economy after an emission delete and reprogram.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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