I'm wondering if anyone knows the normal exhaust temperature for a stock F430 manifold? I'm going to install AP headers and cover them in Jet-Hot. To avoid the need for an exhaust shell or blankets, I got an "Ultra" Extreme Coating (exterior), however I'm also considering getting a "Regular" Extreme Coating on the inside. It is said that the interior coating may not hold up if the exhaust gas temperature exceeds 1250 degrees Fahrenheit, is that true?