GLM Manifolds are superior in the Aftermarket Marine Parts Industry! Designed to Increase Performance, Reduce Back Pressure and Add More Horsepower to Your Engine! This listing is for two (2) exhaust manifolds and two (2) 3" 15° risers (elbows) for 1983-1984(approx) Mercruiser MODEL 200-320, V8 (S.B.), GM 305/350/377 CID (serial number 0M299999 and below.) P/N (2) 51230 (GL51230)+(2) 51110 (GL51110); equivalent to the contents in GLM part number 58231.
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