CraZyRunner

I was driving threw town today, and a lifted taco pulled in front of me. At the light i rolled down my window and to my surprise it was extremely loud and looked like it had an exhaust system of some sort. I know your thinking ya there are alot systems that will make your truck sound loud, but i have a whole in my muffler and to my surprise it was way louder than my car. So i was wondering on what kinda muffler/ system produces this kind of sound? also it was a v6 and it was a 89-95 pickup.