Yes, I know what you mean regarding the usability of the back seat because my kids love jumping in the back freely and joy riding with me. Well, I figured I would find out specifically from MIR what the actual requirement for a roll-bar, roll-cage, cross-bar, etc... was relative to a certain E.T. They stated specifically a 6-point roll cage along with a 5-point seat belt harness is required for any full body car running 11.49 or quicker (Wow!!!!). So, you don't necessarily need the cross-bar as long as you have 6 points of frame contact and the roof top roll-bar, which is what I have always had in my other GNs. So friend, it's probably best to go ahead and build her right if you know you're going to bust 11.50s wide open.