Hi,
I'm playing with the idea of using a M Performance air box in my 2014 F21 M135i, as it's MHD Stage 2 and maybe it could use more air.
My question is: Has anyone of you tried it and can definitely say, that it was beneficial to use the M2 airbox, as it's less restrictive?
That's the one I'm talking about
:
thanks in advance!
Ben