Ghostfire

I know they both have a VS, however the FR4 has what appears to be a smoother and nicer VS then the BMP filter. The down side is the FR4 isn't open at the top leaving out a lot of space to collect more head on air. The FR4 is however 2x as light as the BMP filter. I currently own a BMP filter but spilled some tranny fluid on it and I am looking to replace it. However I do like the BMP filter and it had a noticeable improvement over the cheap filter from Auto Zone I used for about a month, when I was creating my intake. Anyway I am just looking for more opinions or comments or even info regarding either ones flow charts or characteristics. Also if anyone has had the FR4 and would like to compliment or discourage its use then please speak up. : )Thanks!