After reading through the site a bit I completed the airbox mod and installed a K&N filter. Opened up the 4.0 a bit and there is a trace of growl lurking under the hood now. Good one.
I also removed the front license plate bracket for a cleaner look. However I found that after having been in place for 5 years there were some marks of abrasion and discoloration. Bum. I know I am probably not the only one who has found this to be true, so I ask the forum veterans: Any suggestions for a fix?