Hedman Hedders 21133 Oxygen Sensor Header Reducer 3 in. Collector To 3 in. Exhaust Tube Size 3-Bolt Flange Sold Individually Oxygen Sensor Header Reducer Hedman Hedders 21133 Oxygen Sensor Header Reducer; 3 in. Collector To 3 in. Exhaust Tube Size; 3-Bolt Flange; Sold Individually; Authorized Dealer - 100% Satisfaction Guaranteed Hedman Hedders 21133 Warranty: Yes