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Big dave built an air dam that drug on the ground and seemed to get good results.
I took his big dam idea and built a much less extreme version only going down 9''.
Big dave and aerohead both use fast backs.
I think big dave claimed his fast back netted him +3mpg.
You can build your own fast back, there are only about a dozen build threads for them.
A bigger air dam and fast back wont void your warranty.
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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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