Every Doug’s header is tuned with the proper tube size and length to efficiently remove all the exhaust from each cylinder, reducing pumping losses resulting in a dramatic increases in horsepower and torque. Doug’s headers are carefully developed on the vehicles they are intended to fit and are re-checked numerous times during the design and manufacturing process.
3/8″ Thick machined flanges…no warping CNC mandrel bent tubes… accurate fit & better flow Precision formed long transition collectors and long tube design… reduces backpressure and increases higher RPM horsepower Heavy 16 gauge tubing…longer life Tubes are pre-polished to remove scratches and the header isfinished with a Hi-Temp Black Coating Doug’s Headers D103-B 1 3/4″ 4-Tube Full Length Header AMC Javelin V8 68-79 Hi-Temp Black Coating Black Collector: 3 Port Shape: SAP Primary Tube: 1 3/4 Dog leg exhaust port emissions code: legal only for off-highway use (except in California or states that have adopted California emission standards) with: No A/C Doug’s Headers D103-B 1 3/4″ 4-Tube Full Length Header AMC Javelin V8 68-79 Hi-Temp Black Coating Black Collector: 3 Port Shape: SAP Primary Tube: 1 3/4 Dog leg exhaust port emissions code: legal only for off-highway use (except in California or states that have adopted California emission standards) with: No A/C Application
1969 American Motors AMX 4.7L/290 V8 1969 American Motors AMX 5.6L/343 V8 1970 American Motors AMX 5.9L/360 V8 1970-1979 American Motors AMX 5L/304 V8 1969-1970 American Motors AMX 6.4L/390 V8 1969 American Motors Javelin 4.7L/290 V8 1969 American Motors Javelin 5.6L/343 V8 1970-1974 American Motors Javelin 5.9L/360 V8 1970-1974 American Motors Javelin 5L/304 V8 1969-1970 American Motors Javelin 6.4L/390 V8 1971-1974 American Motors Javelin 6.6L/401 V8
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