It may not be the worst race-car movie ever made, but this noisy valentine to producer Daniel Sedak's personal collection of exotic cars makes 2001's THE FAST AND THE FURIOUS (which, ironically, was shot as "Redline") look brilliant by virtue of its sheer competence. Knockout Natasha "Nat" Martin (Nadia Bjorlin) is every 12-year-old boy's dream: She' more