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From what I have heard the only ships that emit low NOx are ones that use gas turbines.
The biggest users of gas turbine are the US navy as far as I can tell. Because gas turbines are very high dollar, need fairly clean fuel, burning high sulfur can erode turbine pieces.
The big diesel piston engine ships and boiler ships have little to no emissions controls.
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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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