Mercruiser 3 in. Exhaust Riser | Barr Marine MC-20-98504 Direct replacement exhaust elbow fits many Mercruiser engines with center rise exhaust manifolds. Barr Mercruiser exhaust riser Fits Mercruiser 898R, 228R, 260R, 330, 340 and 454 Magnum model engines with center rise manifolds For use with 3 in. ID marine exhaust hose 15 degree angle Includes plugs, gasket, and mounting hardware Heavy duty cast iron Painted black Replaces Barr MC20-98504 Replaces Mercruiser 98504A3, 95755A2, 98503A2