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Schoenfeld introduces a performance driven 1 3/8” to 1 ½” stepped primary header complete with 1 ¾” tri-y collector. Complete with slip-on elbow. Available for R6, R6R, Kawasaki 636, Susuki GSXR and Honda 600. Also available in non stepped version for restricted cars. Many engine builders are saying that the open 1 1/2" primaries are too big for the restricted engines thus not allowing the engine to mainatin back pressure. Check with your motor builder for more details.