I want to make my 2003 expedition louder than it is without buying an aftermarket exhaust. Ideas?

well do not put on just stright pipes they are super bad for your valves because it will cause low valve presure plus if you need to pass emitions you will fail. i would do like the first guy and put on some glass packs they will give you a nice sound. and they are cheap. remember that the shorter the glass back the louder they are. i would also hollow out the cadalidic converter but thats ilegle hehe. well good luck. just a hint if you clean out your cadalidics you will gain a little more power. just so you know.

The only thing you can really do is hollow out the stock muffler. I would go and spend 20-30 on a glass pack muffler. That will give it alittle tone.

so which you should make your motor vehicle louder by some ability, with out spending plenty money, with out doing something to the exhaust, and no stupid solutions? and you rigidity no stupid solutions. properly short answer is you could not, and stop being this form of div.

Put straight pipes we did it ourselves and they are kick @$$

other than cut it off not really