18 Airflow testing indicated that the stock 80mm throttle body flowed 957 cfm compared to just 772 cfm for the factory air inlet system. If anything was restricting the airflow, it was definitely the air intake system. Given the change in tube diameter from stock to JLT, it was necessary to alter the MAF scaling to properly tune the engine. After dialing in the air/fuel, we were rewarded with 515 hp and 441 lb-ft of torque. That is serious power from a stock 5.0L equipped with cams, headers and an air intake.