I convinced TTI exhaust to put to market a manifold back exhaust for sale to the general public for a slant six. He had done it a few years back for one of the magazines but here it is ready for purchase and a real part number. It was a super simple install laying on my back in the front yard, took two hours from jack up to jack down. I started it up and it has a great sound to it, I tried to get a video of it but the sound does not come through good at all. Notice the O2 bung???? Well that will be used later on a different upgrade.