A front air cover sound like a grill block.
The air dam keeps air from getting hung up on the under side of the vehicle.
An air dam and grill blocks can change the vehicle appearance as much or as little as you want, only thing that limits the visual impact are your imagination, time and budget.
See this:
Car MPG Efficiency Modifications Main - EcoModder
Some mods are vehicle profile specific so they only apply to pickup, car or SUV bodies.
Others are engine specific there are big differences between how the same mod can effect diesel versus gas engines.
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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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