Thanks. I think it’s a J&J out of Ohio but I will try to check with the guy I bought it from. My Duster was pretty easy because it has a rack steer in it but we also just put one on my sons 70 Duster. We had already modified his 1 7/8 headmen headers with a four pound hammer because of his Milidon oil pan. Over the Winter be trimmed his k members lip off and welded the seam and it went on pretty easy. It’s heat resistant but not Kevlar and because it’s thin pretty user friendly