Project Munin/68 Dart

I've been waiting on some parts so I decided to start some chassis stiffening work. The side pieces will weld in and the center piece will bolt in so I can get to the trunk should the lock ever fail. I used just 22 gauge but you'd be amazed what some dimple and flange work will do to a panel. These should tie up the rear really well with minimal weight. I will get them welded in a little later when I'm doing the exhaust and trunk floor. I also started my side exit exhaust, it will make sense a bit later.

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what are the tabs on the oval pipes for ? been thinking of oval ,out the side for my fish, but don`t really want to add the weight. 3 1/2" dumps are fairly heavy to start with.