Do long tubes help the engine cool down faster?
It has no impact on how fast an engine will cool...that will depends on coolant and oil temps. The only thing I noticed (besides a better sound and better performance) from long tubes was an increase in underhood temps.
I had my headers coated despite being stainless steel. Underhood temps are significantly lower than a friend of mine who had uncoated headers. He actually got his coated since it was pretty unbearable to open the hood, felt like opening an oven. It's pretty deceptive in y engine bay, while my headers get cool enough to maneuver around, things like header bolts, coils, air tubes etc still hold a lot of heat. I was getting mini 3rd degree burns today trying to change wires due to touching the various things around the headers after 30 mins of driving the car.
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The thinner metal of a Header (and if coated header) would most likely cool down faster than a stock cast metal exhaust manifold. But I don't think it will assist that much in cooling down the rest of the engine itself as a whole. So in a very, very small way, yes it will assist in cooling down your engine faster.
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