Quote:
Originally Posted by oldman
I view the exhaust system as a heat sink.
Race engine open header, yep the more heat retained before ejection to the atm, the more HP is to be found, in general of course.
For a street car, especially one with headers hooked up to the factory cat back, to my mind the question is moot, does a coated header which has more retained heat and energy at the header exit point into a muffled exhaust system yield more engine power? I HIGHLY doubt it.
Will my engine compartment be slightly hotter when I'm in grid lock with non-coated headers? Yep.. don't get into a 1/4 mile throw down in the center of Austin at 7:30 in the morning.
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Temps around the headers coated vs non coated can be up to 400 degrees different depending on how close you get to the tubes.
Best investment you can make when it comes to performance exhaust mods.
There is a lot more to it than Dyno numbers.
Ted.