I have 2 set of mild steel made by the end of this week. I'm doing a group buy if anyone interested. I have 10 set in 304 stainless steel. The kit come with header and 3-1/2 inch downpipe. Mild steel is $2-inch 500 and stainless is $3000 original price. Group by will be $150 off original price. All purchases will be going GNS performance