I was planning on a single 5-6" in the pass. corner. Basically all I need is a 90 off my current exhaust and the stack. I'm going to get some 6" box and make the S pipe myself, basically a 4" sleeve through the bottom of the bed and a 5-6" sleeve sticking up. I plan on painting the stack black or gray, so I was planning on just miter cutting some exhaust pipe for the stack. But let me know what you got, would be a good reason to finally get together and drink some beers:-laf