Equipped with our performance Stainless Steel High Flow Risers, these are our best performing systems. They are a direct replacement for stock Mercruiser manifolds in Bravo and Alpha applications where the exhaust outlets exit through the transom in the stock location. The 16" long riser is a must with High Performance camshafts to prevent reversion (water ingestion). These will NOT work with Selector systems or stock "S" pipe connections. (There is an additional charge on some late model EFI systems). Standard with black Fusioncoated finish-optional finishes are available. System includes 1pr. EMI Exhaust Manifolds, 1pr. High Performance Stainless Risers, Bolts, gaskets, fittings for Small Block Chevy . Brackets extra.