S&B Filters 73-1006B Airflow Value Package: Includes 75-5038 & 76-1006B Custom air box protects the filter from engine heat and dirt along with a clear lid allowing for easy filter inspection and removal. Street Legal In All 50 US States The smooth design of the S&B Intake Elbow significantly improves the airflow after the intercooler. The result is denser air delivering more power and better fuel economy