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First thing I did to my 2000 Dak was get rid of the rubber flap behind the grill and take off the air box snorkle and buy a drop in K&N filter,now you have some ram-air that has cost you zero dollars and has woke up the 3.9
I had a '98 3.9 and I ended up selling it out of frustration. I did everything external, except headers, and gas mileage/power did not significantly improve. Sorry, but the 3.9 is a turd.