i just built a one peace piping exhost on my 4dr to make it lighter and i got about 45lbs off from the stock and im ordering a silencer but i no thats not gonna be enuff is ther some kind of material i can put in it to make it quiter??

 

Yeah, mugen twin loop.

 

that is what a muffler is for. I believe you can hook up resonators to your exhaust as well to tone the exhaust sound. I haz two rezonators on mine.

 

Seriously?