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The only time they are going to help is if they are placed on the vehicle and studied in a wind tunnel. Or placed by someone who specializes in automotive aerodynamics and has spent a lot of time hanging out at the local wind tunnel.
These little things actually increase drag and what you are trying to do is place these drag increasing structures ahead of a very large drag increasing design feature, to try and reduce drag.
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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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