Have a 06 4x4 20,000 miles 3. 73 48re stock except for gauges. Smarty due next week. My question is,will I notice any improvement in a complete exhaust system , other than looks ?? Would I be better off just adding a snazzy tip?Also ,the stock air filter system has to be somewhat restrictive. Could it be opened up as I have read in these post or are one of the aftermarket boxes better? I sort of like having the engine compartment appear stock. If you were to do any of these ... Which Exhaust ... Which tip... which air box. ???Thanks in advance. Never had any trouble pulling the trigger on this type stuff 15 yeara ago,but now with all the choices out there I just want to buy one time