Tune pipe for Magic Bird suitable with OS37,46,55,61

Seagull SEA380PIPE - Exhaust Pipe Set for O.S. MAX-35AX, 46AX & 55AXThis tuned muffler set is designed to fit O.S.Engines MAX-35AX, 46AX & 55AX engines.It includes the side exhaust header pipe, tuned pipe with pressure nipple, silicon coupler, clamps and a mounting bracketThe tuned pipe is anodised blue