I still don't understand what the problem is. Simple physics dictates that there is less airflow and higher temps at lower speeds. Can you please specifically state what problem you think you are having with your vehicle? High engine temp, if so what temperature?

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record