Yes you can drive it if you soft shoe it. I have a 03 4 door long bed and it does not make much till I get on it. So go ahead and do it . Keep your muffler. You can get a 03 04 kit from [url=http://www.genoesgarage.com] for 69.95 that you can put on it. If you don't like it you can put the muffler back on. Don't let any one cut off the muffler!! DO IT WRIGHT. === good luck ===