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Constructed by hand utilizing CNC cut exact-fit flanges, 1-3/4" tubes. And 3" collectors. Named " smooth Flow" as result of their construction having no sharp bends and very few welds. These headers are manufactured by the same folks that worked with GM to produce and supply the headers for the LS-1 engines in ASA racing series. Threaded oxygen sensor bungs come installed. Call for pricing on our race headers without the emission tubes installed. These hand welded headers are bent as opposed to being welded piece by piece, as result of this you will find better exhaust efficiency over other systems. The 3/8" flanges are CNC cut - the tubes are 1 3/4" aluminized steel
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