This exhaust pipe set is intended for RC use with the listed O.S. Engine FS models. The 60 degree bend is matched to work with the exhaust pulse characteristics of FS-40, FS-61 and FS-80 engines, allowing tuners to shape back-pressure and routing without internal engine modification.
The parts are offered as replacement or upgrade items for existing tuned-pipe assemblies. Fitment focuses on FS-series manifold outlet spacing and mounting points; verify manifold outlet alignment and gasket seating before final tightening. Basic hand tools are normally adequate; avoid overtightening flange fasteners to preserve sealing surfaces.
In tuning practice this pipe functions as one element of the exhaust system that affects pulse scavenging and midrange delivery. After installation, expect to adjust carburetor settings or header length to match the new exhaust characteristics.
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