I am not sure if that is the same article.....but I got my '04 sport in '04...I only get into deep mud or extreme dusty dirty conditions 2 or 3 times a year...I have flowmaster exhaust, with a high flow cat, air raid throttle body spacer and "CAI" kit...IMO it is better than it was stock....call it placebo effect...it is okay with me.
I have 31" 3.73's OME lift 5spd...I get 17-18mpg in town, and 20-22 on the highway @ 55mph. If I run 70-75mpg on the highway it drops to 16mpg.
I get a lot of compliments on the sound and on the road it is not to loud or intrusive. I did these "MODS" before I joined WF...and I am happy with them.