The general rule of thumb is that the closer the part is to the engine, the more important it is to wrap or coat. Therefore, headers being the most important, overpipe/frontpipe being second, and the rest last. My recommendation is to only coat the headers and the overpipe.
Wrapping or coating the frontpipe + midpipe can actually result to decrease in performance. The reason you want to coat the headers + overpipe is because the hotter the exhaust gets, the faster it expands, and exerts this force into the turbines of your turbo making it an effective system. After it passes the turbine, you want it to cool down as fast as possible.
By coating or wrapping your front/mid pipes, you are essentially adding more pressure where it has no benefits leading to unnecessary wear to your exhaust parts.