When I installed my ATP DP I also did my CBE, which came with a new gasket. I re-used the stock fire-ring on the turbo side and the ATP DP comes replacements studs for both the turbo side and the CBE side. I apologize but I don't know the sizes of the top of my head. Maybe someone else can chime in with the hardware sizes. As far as the turbo side bolts you may be able to get away with using the stock hardware, and I would just find some appropriately sized bolts and nuts for the CBE side. I would give the stock exhaust gasket a good inspection and if it looks ok, I would just rock with it.