Anyone use the funnel to put a 80mm fan on yet?

[rocknindy]

Anyone here tried one of those funnels to put a 80mm fan on a heatsink?. If so what where your results?

[toutin]

I made one to replace my 28db 19CFM by a 25db 31CFM
no significant improvements.
But I suppose it will with some serious and noisier 80 mm fan