i am really having a hard time deciding on which cat back system to buy my two choices are flowmaster american thunder super 40 muscle truck and the other one gibson super truck i want it to be loud

 

if you want cool sound, go with the flomaster. if you want power, go with the gibson.

 

What he said.

 

I got the American Thunder on mine and I just wish it was a little bit louder. I like the sound of the Flows. I always had them on everything else I've owned.

 

Same here I always loved the sound of flows. If you want somewhat loud go with a 3 chamber flow. If you want really loud 1 chamber should to it for you.
Seen some trucks with two 1 chamber flows dumped and with no cats. You can hear it coming form inside your house and 2 blocks away.