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Schoenfeld Adjustable Collector IMCA Headers - 1-5/8" Diameter - Style 9 Left Collector, Style 8 Right Collector - Standard SB Chevy Flapper Valve David Vizard's How to SuperShorter primaries increase flat torque range with crisp throttle response. Started in 1974, Schoenfeld is known for custom fabricated headers for all forms of circle track racing. Schoenfeld Headers is the worlds largest manufacturer of circle track headers, but they specialize in a variety of high quality exhaust parts, including turn downs, extensions, tubing bends and elbows, race mufflers, insert mufflers, mandrel bends, exhaust reducers, header