My 427 undercar exhaust - I had the headers, collectors/head pipes and mufflers ceramic coated inside and out. Painted the tailpipes semi flat heat resistant paint.
Forgot to add I did wrap the tail pipes in the rear wheel wells as on the 427 cars a 2-1/2" tailpipe runs just a fraction of an inch from the tire and trunk liner panels. May not be an issue on 289 cars.
