A buddy of mine has a Rzr900. Rocks from his tires kicked up and were able to contact the rear of his radiator! He didn't notice this until he was 25 kms back in the bush. When the radiator finally went is said it drained quick. He has a little water bottle him so filled up in puddles every 5 minutes or so. Said it was an awful ride out. $350 for an after-market rad. He's adding guards to avoid a second rad perforation.
I looked through the wheel wells of my P5 and have a good view of the back of the rad. I think Honda has designed things to avoid this sort of damage.