... for flanges 3.Strict quality control Condition:AUDI 2.7L Exhaust SystemMaterial: SS201 or SS304 for header, downpipe and catback 6061 ... for intake pipesAll exhaust tips in SS304, 1.5mm tube thicknessBeautiful weldjoint, flat Flange and clean air holesExhaust system in Mandrel Bend ... .7L HEADERSSKP-7400AUDI 2.7 DOWNPIPESKP-8046AUDI 2.7 CATBACK Exhaust System includes header, down pipe and catback