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You don't want cold air intake of you ate trying to improve mileage on a gasoline engine.
Big over sized exhaust is the same way.
On a gasoline engine anything that increases "hp" is going to usually lower MPG.
These companies may claim there is a fuel economy improvement by adding their products but as far as we can tell it's a lie.
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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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