Same thing if I'm not mistaken?
Is your rolling road test not between a ph1 and ph2 airbox? Where does a v6 box come into it?
Ph1 and espace v6 airboxes are the same bar the cold air feeds, there is one big one of the espace, the ph1 has 2 smaller ones.
They're worth it for the sound. I had 2 weeks back to standard airbox with my Yozza and it was boring, fitted it back over and it's such a nicer sound!