Today i bought the 29.5 inch CB glass pack with 2.5 IN/OUT and put it in place of my stock muffler everything else i left the same with the 4 cats and ... im not going to lie it sounds great for 23 bucks

 

i did the same thing on my 2001 5.4, except my friend had a thrush glasspack laying around and said we should put it on my truck. so all i did was pay $12 for clamps and a small pipe and we put it on that nite in my driveway. It does sound pretty bad *** for so little money. I plan on doing a true dual exhaust this summer with hi-flows, x-pipe and i mite use glasspacks again