Clio R3 Airbox input

Hi!

I have searched the forum but found only a few info about experience with R3 airbox kit.

Wanted to ask you guys here if somebody did the complete R3 airbox installation and are there any RR printouts before/after, or at least experience of the gains

The only thing I came across experience-wise is mention that there will be more peek power but less low-down.

I am aware of the battery and tank relocation, also wanted to know if it is possible to fit a small batter behind/under the airbox somewhere.

Thanks!