2-1/2"

2 Bolt - Stainless Steel - Honda Header Collector Flange 2-1/2" OD Tube Round Holes 17mm with center of 120mm

2 Bolt - Stainless Steel FlangeDesigned for a 2-1/2" Tube to slip into it, flange is designed with inner lip.Casted Stainless Steel

2 Bolt FlangeStainless Steel2-1/2" OD TubeLaser Cut.5" Bolt Holes

2 Bolt - Stainless Steel - Subaru Header Collector Flange  2-1/2" OD Tube Round Holes Hole to Hole 4.25"

2 bolt flange constructed from Titanium material with an ID of 2.50". This flange can mate to titanium, aluminum, steel or stainless steel flanges. Material: CP2 TitaniumInner Diameter: 2.50 Inches Measurements: Bolt Center to Center: 3-3/4" Side to Side Total Size: 4-3/4" ***Sold Individually ...