Well after reading all the comments, I have to say some of you guys are not so nice about simple questions. He just asked if an '04 v6 exhaust would fit. Done. No need to rag on him.
The only thing I would say is you could have searched this topic but you've gotten all of your answers.
Basically everything JMillerF23A1 said:
1. Add a functional dual exhaust, lose low-end torque. Reduce torque loss by using smaller diameter pipes to the mufflers.
2. Weld on another muffler that is not connected to the exhaust pipe.
Do it if you want. Ignore people who call it ricey because it honestly isn't. Actually kind of ridiculous to compare it to underglow.