Chuck, thanks for your question. Everything seems to be close in these cars. There is very little extra room anywhere. How we mitigate the problems is the fun part of the build. Two things control the heat factor. Number one is the ceramic coating on the pipes. Secondly is the heat shield that is above the pipe. Between the aluminum shield and the fiberglass there is 1 inch of insulation material. The fiberglass does not even get warm. Enclosed are a couple of pictures of the heat shield. On one I pulled away a piece of the trim so you could see the installation.