Rev9Power Rev9_AC-035; Exhaust Flange(2.5 Inch); 2 Bolt(Stretch Bolt Pattern) Product Details 2 BOLT EXHAUST / DOWNPIPE FLANGE MADE OF HIGH QUALITY MILD STEEL 2.5" CIRCLE INNER DIAMETER 8MM THICKNESS STRETCH BOLT HOLES ( center to center 103mm) END TO END LENGTH : 133mm / 5.25" )