loud exhaust?
Somebody want loud?
Take a 55 gallon steel drum and paint it whatever you think will look like you want if it was permanently sitting in the bed of your truck. Bolt the 55 gallon steel drum to the floor of the bed right behind the cab, cut two 3 inch round holes in the floor of the drum and bed floor. Cut the truck's exhaust just before the Y where they come together and custom bend two pipes from the stubs and point them up through the two holes, let them stick up a few inches into the drum. The gaps between 2-1/2 inch pipes and the 3" holes will allow rain and snow to run out.
Take a 55 gallon steel drum and paint it whatever you think will look like you want if it was permanently sitting in the bed of your truck. Bolt the 55 gallon steel drum to the floor of the bed right behind the cab, cut two 3 inch round holes in the floor of the drum and bed floor. Cut the truck's exhaust just before the Y where they come together and custom bend two pipes from the stubs and point them up through the two holes, let them stick up a few inches into the drum. The gaps between 2-1/2 inch pipes and the 3" holes will allow rain and snow to run out.
The OP has a 97 I think he said, Roush cat-backs are made for the 04/08 trucks only so would be a bit of fabrication involved.