507 with ROW boxes. What gains are to be expected?

https://mbworld.org/forums/c63-amg-w...dyno-test.html
It has me wondering. I have a AMG 507 still going through its 1,000 mi break in but in a few hundred miles I might like to try the ROW boxes.
Has anyone tried them and dyno'ed their 507?
Were the gains the same?
Any feedback would be appreciated.
Thanks !






