I haven't installed my ASFIR engine skid yet. The install directions, if you can call them that, say to remove one of the cross members before installation. Is that cross member replaced at some point?I also have the aluminum asfir setup. I wanted aluminum to save weight and wasn’t ready to shell out $2000 for a full underbody system. I’m happy with it and don’t recall having to pay any special taxes on it. Easy to install.