1 One of the simplest welding projects most of Super Chevy readers are going to encounter will be a rollbar. While exhaust tubing is probably more common, it's a bit harder to practice on because it's so thin. The thicker material of rollbar tubing is a bit more forgiving. Here is a typical rollbar set up you will need if your hardtop car runs at/below 11.49, or if you have a convertible running 13.49s or quicker. Anything faster than a 10 second E/T, and you'll need a certified cage. There is one more bar not shown in the picture, which is the driver's side door bar that runs from the seatbelt bar down to the kick panel area. These DIY rollbar kits can be picked up from Chris Alston's Chassisworks, pre-bent and ready for you to weld together.