You will receive a new C&L mass air system calibrated for 42# injectors. Other calibrations are in our eBay store. We have been using these 76mm kits for several years on customer?s cars with great results. Most Mustangs will see 13-14 rwhp and 17 ft. lbs. of torque. Not only do you get the high flow mass air meter you also get the TrueFlow inlet pipe. This replaces your stock rubber elbow and increases power by increasing the velocity of the airflow and keeping a 76 mm airflow path all the way from the mass air to the intake. The TrueFlow elbow also comes with a nitrous boss that can be drilled out for easy nitrous installation. C&L also provides you with the torx bit needed to remove your stock mass air sensor electronics.