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The engine is an air pump. These items make the pump more efficient. While they are geared more towards HP (speed sells), they ultimately decrease the restriction in the pump. Yes, it is possible to go overboard, but a basic air intake that smoothes intake flow, lowers restriction, plus exhaust that is similiar in diameter to stock, but lower restriction in muffler and piping design will let it breath.
On my 1997 Ram, I have the intake, headers, high flow converter, exhaust, quality ignition components, and electric fan.
The difference is noticeable.
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Current MPG driver:
1994 Isuzu Rodeo - Beater with a Heater...
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