ok guys, have another stupid question

Seeing that I have no experience with installing a single stack on a truck, I was going to ask this. The truck already has 4in silverline exhaust. The muffler is still on the truck. While I was looking on Alligator Performance I found a universal 4in stack exhaust bend. Now will this work with the silverline exhaust? Do we need to make any brackets or anything for the actual stack? We plan 7in so I guess I need to find a 7in stack with a 4in inlet.

 

I'd make a new thread to attract a different crowd of people to answer that question.