When the Ford Racing School at Miller Motorsports Park in Tooele, Utah, wanted to upgrade the transmissions in their fleet of Mustangs, they turned to Tremec. The Magnum XLR takes the proven XL transmission and incorporates an SFI-spec bellhousing, an aluminum propshaft, and roadrace-specific gearing to create the ultimate track day 6-speed, capable of handling 700 foot-pounds of torque and all the abuse the students and instructors can dish out.