Compatible w/Stock Fittings and Emissions Features. Requires No Changes to OEM Computer. Excellent Throttle Response and Mid-Range Power. 50-State Street Legal with OEM TPI.Can Be Further Ported to Improve Flow Capacity. Match w/Aftermarket Head /High Performance Cam. Makes 18 to 20 More Horsepower Over Stock. CONTACT FOR SPECIAL OFFERS AND DISCOUNTS.