I haven't actually had the car running yet, engine just finished getting rebuilt and installed today. Although we wrapped my buddies the same way and it dramatically reduced bay temps but holding your hand behind the actual exhaust pipe exit seemed hotter. It smoked and smelled for awhile but runs and seems normal now. On both cars we cleaned thoroughly the header with a steel wire brush and then a grease removing solvent. High heat paint coated them, wrapped then silicone coated
where at in nashville are you? I'm in the hermitage area and have a '12
sorry for being off topic.