Look what came in the mail today

Piping came in the mail today too. Now I just need get a pipe notcher so I can start assembly of the exhaust manifold! I got six 45 degree elbows, two 90 degree elbows, and 4 feet of pipe. They are 1.67" inside diamater schedule 40 pipe (304l stainless steel). I know welding stainless steel to mild steel is a pain but I have talked to a couple guys who weld for a living and they said as long as I use 309l wire, I shouldn't have a problem.