We produce stainless steel one piece high performance manifolds for most sterndrive and inboard engines, petrol or diesel. Available for Mercruiser Volvo OMC Indmar Crusader Chrysler PCM Cummins Perkins GM Detroit etc. 5 year warranty, light weight, improve HP and Torque by 10-15% and fuel savings reported up to 30% (they will pay for themselves with fuel savings. Replaces factory manifolds and risers complete with all brackets or custom and high output versions. We also produce stainless steel mixing elbows for many turbo diesel marine engines. Worldwide shipping quick turnaround for units not in stock.