no member i can assure you, will advise a straight pipe... sound is terrible, and theres no real gains, other than gaining unwanted attention lol...
my suggestion, would be go on youtube, and search " explorer exhaust " and find a particular flowmaster or magnaflow or cherrybomb muffler that you like. then go to your local exhaust shop, and have it installed...
im going to list the ( SIMPLE SET UP CATBACK EXHAUST ) for you...
1. remove factory resonater.
2. run 2.5'' pipe from the end of the ( Y-PIPE ) to the muffler.
3. choose whatever muffler you want to install
4. run 2.5'' pipe from the muffler.
5. run the pipe over or under the rear axle ( your choice )...
6. choose your tip of choice, and exit angle ( 45 degree exit or straight out like factory )
*** now i will list the pro's and con's, that i have discovered with this set up
PRO's - 1. increased MPG / 2. increase 5 to 15 HP/TQ ( pending vehicle ) / 3. better towing ability
- in regaurds to increased MPG's just from my experience, i gained about 35 to 40 miles to every tank of gas, so the money you put out will pay itself off in gas over a relatively short amonut of time... I had a K&N INTAKE, and CUSTOM CATBACK EXHAUST to validate the mileage increase for your info...
CON's - 1. loss of low end TQ... but in a sense isnt really lost, but more so moved into the higher RPM's
*** now you may wonder what this might cost you ???
- exhaust shops can vary in price like the weather, but most custom CBE's can be hooked up for as low as 250$, and up to as high as 500$... it depends on what muffler you buy, and how much the shop is going to charge you...
thats the set up i ran on my RED 03 XLS, and what i plan on doing for my new 05 Silver XLT...
hope this helps ya fella !