GLM Manifolds are Superior in the Aftermarket Marine Parts Industry.
Designed to Increase Performance, Reduce Back Pressure
and Add More Horsepower to Your Engine!
Our fully tuned design guides exhaust gases directly to riser without turbulence and back pressure. This increases
the engines performance up to 10%. In the meantime, an additional 40% water cooling area will decrease the entire manifold
body temperature significantly
Mercruiser 262 305 350 454 502 4" Riser Elbow GLM 51148 Dry Joint Conversion
