THERE ARE ALOT OF WAYS TO MAKE YOUR EXHAUST LOUDER FIRST CHANGE TO A 2 CHAMBER MUFFLER THEY ARE LOUDER THAN 3 CHAMBER,ALSO THE LOCATION OF THE MUFFLER AS IN HOW CLOSE TO THE END OF THE EXHAUST IT IS CAN MAKE IT LOUDER ,AND VISE VERSA,ALSO REMOVE THE CATS (IF YOU DONT HAVE EMMISION LAWS) THEN IT WILL SCREAM
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2001 5.9 with heads ,cam,alum. roller rockers,headers,true duals with 40s flowmasters,55 milim. tb,mopar intake new fuel rails,,and so on....
glasspacks are very cheap and loud.................they only run like under $50 ea.
in my area glasspacks run around 20 bucks. I've heard some on Dodge trucks and I must say they actually sound pretty good. It's not the typical glasspack sound you always hear on the chevys. I'm going the glasspack route soon when I replace my exhaust from the cat-back.