Blitz ATF Cooler Scion xB 2003-07 Keep your xB tranny cool is essential under harsh driving conditions. These may include towing, higher horsepower levels, extreme heat, frequent transmission abuse, etc. . All of these and reason not listed, will all require a transmission cooler to keep the heat down. As anyone knows, automatic transmissions are renowned for premature failure due to excessive amounts of high. With this kit, your xB's transmission is sure to last longer with smoother shifts every time. Purchase this cooler kit and protect your xB today. Great for supercharged xB's.