Wow. Great Topic. I too was going to have a cage put it my street car. Removable Sides and Cross Bar. I realize this probably will not meet NHRA standards as a valid cage but it will get me on the local track (me hopes). The bars would be removed for street driving and the cage will be as close to the pillars and ceiling as possible. The goal here is to stiffen the car up a little and provide some type of rollover protection at the track.
This post does have me re-thinking the entire thing though. I am only going to have 500 - 600 HP. Production cars are putting up numbers close to this and there is no cages there. Hmmmmm.