Gear sets may be replaced with closer ratios to keep the engine in the power band, or, on some cars that produce enough power and torque to four-gear transmissions similar to the ones used in NASCAR (such as the Andrews four-speed dog box that Vaughn Gittin Jr. ran in his 2016 Mustang[26]) with more open-ratio gears, this limits the number of shifts the driver has to do during their run. These may be coarser dog engagement straight cut gears instead of synchronised helical gears, for durability and faster shifting at the expense of noise and refinement. Wealthier drifters may use sequential gearboxes to make gear selection easier and faster, while sequential shift lever adapters can be used to make shifts easier without increasing shift time.