I cut mine down the middle so it's got a channel for the driveshaft to run down. It doesn't cost a penny.
The only problem is I did this after the pressure caused excessive wear on the cv joint on the kit driveshaft and I don't dare post a pic of what it did to my Tresery driveshaft!!
My wasn't straight out of the box, I should've got the wife's hair dryer and warmed it up and bent it the other way before a built the car. Anyone got a time machine?