Roush exhaust and cold air intake combo kit. Includes exhaust and cold air intake for the I4 EcoBoost. The all-new 2015-2017 body style Mustang 2.3L ROUSH Cold Air Kit is more efficient air-intake than the standard stock air box. A custom tune is not required as this CAI system was engineered and tested specifically for this application ensuring MAF signal performance matches factory settings. As a straight bolt on, with no tune, it’s possible to see gains of 30 hp and 28 lb-ft of torque, a VERY noticeable increase. Give your 2015-2017 2.3L Mustang a more aggressive sound and boost performance with a ROUSH exhaust system. Mandrel bending maintains a constant inner diameter with no kinks or creases. This improves exhaust flow and reduces backpressure in the system. This system includes single tip High flow mufflers that improve the stock sound of the Mustang EcoBoost.