SF-Modified SCHA engineered for improved shift consistency, lower ETs, and to safeguard components from damage. Upgrading prevents long-term frustration and costs. Extensively modified to address weak points and malfunctions. Replaces weak stock arm with CNC-machined, heat-treated tool steel arm that won't fail. Prevents missed shifts, damage to dog rings and gears, and synchro sleeves and teeth damage. Easier 2-3 shifts, lowers chance of 1-2-1 or 2-3-2 mis-shifts, makes gearbox smoother & reliable, especially for racing.