I bought the speed engineering 1 3/4 inch headers and y pipe for third Gen Camaro($500) then bought the dyno max 2 1/2 turbo exhaust ($177), 2 1/2 to 3 inch step coupling. Then buy the s shape 3 inch pipe to connect the y pipe to dyno max exhaust. Not bad for $677.

$722 with two feet of pipe with 45 degree with expanded ends to insert piping so you can clamp or have welded