Thread: Bolt-ons = less restrictive, Better MPG???
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Old 07-26-2009, 05:49 PM   #9 (permalink)
dad
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Originally Posted by RCZ View Post
There was a thread before where this was extensively covered. Theoretically the answer is no because the AFR stays the same. In practice, bolt-ons lean out the car which you could argue means less fuel usage.
Headers alone(nothing else, no CAI), won't increase MPG?
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