K&N Typhoon short ram intake for your2004 Scion xA is now available.  K&N Typhoon Kit includes filter, heat shield, suction pipe, and all fittings. Available in red, blue, silver, or polished. K&N claims 4.6 wheel horsepower and it is CARB legal for you California residents

Fits: Scion xA

Tech Tip: Easy installation, can be done in your driveway. This filter is washable and is good for 1 million+ miles