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I think it is because your engine is not wasting as much energy and a lower mounted catalyst will not function because it will not get hot enough under normal usage, it's not just the lean burn engines, it's all of Honda's high mpg cars were like this.
If you want to get more power out of your car then sell it and get a more powerful car, don't rip it apart trying to make it something it's not only to get board with it and sell it to someone who is trying to get better mileage and force them to undo modifications that you did for speed.
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