Has anyone cut the opening through the radiator support on both sides to get a bigger air tube through it? If anyone has, any problems, how hard was it to cut, etc. I would like to get a three inch tube on each side and mate either to the original XF ire aire box or a MB airbox that has more volume. I guess I should consider a new MAF that is larger as well and mates to the larger air box. Anyone know the P/N of these items?