Quote:
Originally Posted by WhiteCrane
Just out of curiosity why wont any manufacturer commit to how much hp you gain on a stock mustang?
i Thought the whole point of cat back exhaust systems and headers, and a manifold was horsepower. I guess not. Sounds like its all for noise.
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Some headers do relatively little, but are emissions legal in every state. Others can provide a decent gain, but aren't always emissions legal. A cat-back system can free up a few horse power, but most of the time people do it for the sound. So its entirely possible that one combination of headers + catback = +5 hp, while another combo could be +25