Unleash the hidden power in your naturally aspirated 2005-2009 Mustang GT 4.6L V8 with this easy-to-install cold air intake kit from ROUSH Performance! Cold air induction is a much more efficient air intake method than the standard air filtering process that the stock engine utilizes. The result is that the air entering the filter is cooler, which leads to a more efficient combustion process for the engine. Due to the increase in air flow supplied by this kit, you will also experience better throttle response and overall engine performance. This kit can be installed within an hour, making it one of the fastest and most economical performance upgrades for your vehicle! Every piece in this kit was designed around the OEM CAD data, making fit & finish superb to other manufacturers. No PCM recalibration is required either, so you won't have to worry about spending time and money on a new calibration. Mustang GT Cold Air Intake Kit increases power up to 17 hp. Easy installation (no drilling or cutting required)Fits 2005-2008 V8 Mustang. Note: This product does not fit ROUSHcharged vehicles. NOT 50 STATE LEGAL FOR 09-09 MODEL YEARS. This cold air intake system is 50 State Legal for 2006-2007 model years only: EO #D-418-14 2005-2009 Ford Mustang