All stainless. The midpipe has under 2,ooo miles, and the cats have under 100 miles, all Magnaflow. I cut the flanges off the header side since I needed em! I had to swap back to EO parts since CA changes the smog laws...I came to find this out after I had just purchased the new cats. ***THIS PART WILL NOT PASS CA SMOG This is a nice piece I hate having to sell, give me a fair offer +shipping.