There is very little choice when it comes to E55 airboxes, and none of them cheap -
Renntech - $3500 :eek:
Gruppe M - $3300 :eek:
VRP - about 2/3s of either :)
A couple of months ago I found a brand new VRP airbox on eBay.com, for a few hundred dollars less than retail, so snapped it...