FMF Power Bomb headers

Do they work as claimed? Or are they just another marketing gimmick?

White Bros. claims their header gives you a little more top at the expense of low and mid power. This is not what I'm looking for at all. So far, I've heard from one person that has claimed the Power Bomb header gave his 650 more power everywhere.

So anybody use one? What are your thoughts?

Thanks for any info!

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