Manley Turbo Tuff Series Crankshaft 79mm Subaru WRX / STI EJ20 / EJ25 2002-2021

Part #: 190040B. Manley Turbo Tuff Billet 4340 Subaru crankshafts are ideal for building a robust bottom - end. These crankshafts go through a multi - step heat treatment for maximum strength. They are nitrided to harden, stress - relieved, shot - peened, and 100% magnafluxed for stress testing. The center, crank pin, and counterweights are gun - drilled to reduce weight. The knife - edged counterweights ensure proper balance and the lowest rotational mass. Key features include: 4340 billet for high - horsepower and high - boosted applications, multi - step heat treatment, nitriding, stress relief, shot peening, 100% magnafluxing, knife - edged counterweights, and gun - drilled crank pin and counterweights.

Using your Manley Turbo Tuff crankshaft is straightforward. First, make sure your engine is properly prepped before installation. When installing, follow the standard procedures for crankshaft installation in your Subaru WRX or STI EJ20/EJ25 engine. Be gentle and use the right tools to avoid any damage. As for maintenance, it's a good idea to check the crankshaft regularly for any signs of wear or damage, especially if you're running high - horsepower or high - boost applications. After a long period of use or after a track day, it's wise to have it inspected by a professional. Keep the engine well - lubricated to ensure smooth operation and longevity of the crankshaft. Avoid over - revving the engine as it can put unnecessary stress on the crankshaft. With proper use and maintenance, your Manley Turbo Tuff crankshaft will serve you well for a long time.