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 The section on overhaul needs a separate Wiki page 

Engine Overhaul is a technical procedure and a massive industry in of itself. Engine overhauls are not a sub-category of Engine Tuning. During engine tuning an overhaul may be done, but the procedure of an overhaul needs it's own separate page, as it isn't a descendent and it didn't come from engine tuning (as how it is now displayed).

The new page should be simply

""Engine Overhaul""

Then all the sub-terminology as is listed like, reman, rebuilt, etc...."