Have to agree with 98 Neon. When I modded my 98 Neon RT, put in headers, Big bore TB, cat back exaust, better plug wires and new plugs, Ice Man CAI, filled motor mounts and a racing computer (PCM) I picked up about forty+ horse power and three to four miles to the gallon. Didn't really made a cost savings, the Racing PCM required 91 Octane or better fuel.
Mike
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