We've done a couple sets of cylinders in hoping to find a decent "power place" I guess you would call it. We found that if you go down and away from the center bridge it works the best for bottom/mid, but doesn't help or hurt the top in any major amount. Just go very small amounts and try it, it's amazing how small of a change makes such a big difference in power. But as BigRed350x said, they still look ghetto.