SLP's high flow cast aluminum TPI intake runners are the result of countless hours of dyno testing, flow bench studies and in-vehicle development. They have optimum runner volume and divider lengths to maximize airflow, and produce up to 20 additional horsepower over the stock runners depending on the application. They are cast from OE-quality, aircraft grade aluminum and precision machined for a perfect fit. These runners are an easy bolt-on upgrade for the 5.0L or 5.7L engine in 1989-1992 Camaro/Firebird/Corvette. No additional modifications are necessary. All necessary hardware and gaskets for proper installation are included along with complete instructions. They are legal for street use in all 50 states.