Subject- Roll Bars There are so many different rules With different sanctioning organizations. With the NHRA ,they have tech inspectors that go to the place that is building your roll bar and installing it. It is not uncommon for them to make you change your design, costing you more money and re doing the bar. From time to time ,they may even make you upgrade the bar to a safer design as rules change to promote safety. My friend Don who owns a shop called Chassis Concepts makes his living building Dragsters,Funny Cars and upgrading the old race cars roll bars and cages. They really start getting picky when your car runs 11 sec or below in 1/4 mile. So before you install a Roll Bar, decide where you plan to race,find that sanctioning bodies rules,connect with the tech inspector to help with the design and find a shop that specializes in Roll bars. P.S I have a really cool Chrome Dragster cage that was cut out of a Dragster for upgrade. Not sure what I going to do with it yet.