I have true duals header then cats then two flowmasters then straight out the back I like the sound but its to loud for some people that ride with me is there any way to make them a little quiter when I am going down the highway at like 65 mph and by the way I pick up 3 miles to the gallon by doing this well thanks I know you guys can help me out and if I have to get new mufflers which ones give a nice sound bt not to loud at highway speeds

 

get larger mufflers. flowmasters are pretty loud, maybe try some dynomax welded mufflers or some magnaflows.

 

dynomax are fairly quiet going down the highway

http://www.youtube.com/watch?v=Scokur4ggfc

this is with two cats gutted, and SISO bullet dumped. Its quieter dualed out, and even quieter out the rear.

The camera is pretty sensative, but you can hear the difference in how loud it gets on WOT

 

I cant Believe I just sat thru that entire video!

 

ive got more

heres the shorter version (second race)
http://www.youtube.com/watch?v=ASRaq-i1c5c