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Yes EGR (on a diesel only) reduces power, fuel economy, warmup time and NOx, while it increases HC, CO and soot production.
I say if you don't live in a NOx and PM area then delete the emissions control stuff.
The worse part is the diesel particulate filter regen. Ford claims on their first generation of DPF equipped trucks that DPF regeneration can burn up to 17L of fuel.
I work with people who have newer dodge diesels and have deleted the emissions stuff, they said their fuel economy went from 15 to 20mpg up to 25 to 28mpg.
EGR on a gasoline engine is completely different, don't delete it. It normally gives you better fuel economy.
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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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