Utilizing over fifteen years of EFI experience, BBK engineers have designed and developed the revolutionary direct replacement SSI series of Intake Manifolds for Ford and GM applications that offer huge power gains over stock and big numbers over our competitors manifolds. CNC machined from 356 Aluminum castings that are CAD designed for optimum airflow velocity in all RPM ranges. The new BBK SSI Series of Manifolds are sending the competition back to the drawing board.