I did not even think about the heat shields I took off that were connected to the stock exhaust. I kept the heat shields that were connected the the underbody on. I will order some of what you used hopefully it will help. Quick question first do you think it would help to use header wrap to wrap the downpipes and test pipes with instead? Just because the under of the z is a freakin mess...cleaning wont be easy 17 years of road grime...AAAHHHH