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I have installed the new street thunder after market header with new and better exhaust heat shraud which I use to duct heated air to the intake air filter box. There is no fuel consumption data yet but one big change is the intake air temperature. With the old stock set up I only could get 20 deg. C [68F] with the ambiant air temp at -5 deg. C [23F] and now the intake air is at 65 deg. C [149F] with the same ambiant temp.
One of the problems with cold and snowy climate is that winter driving conditions can lead to a 50% rise in fuel consumption! Partly the result of cold air and partly the result of higher rolling resistance due to snow on the road. So I am gratified that I can keep the intake air warmer in cold temperatures.
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