Manley Performance 83mm Stroke Crankshaft / 21 lbs Turbo Tuff Crankshaft Subaru 2006-2014 WRX / 2004-2019 STI

Manley Turbo Tuff Billet 4340 crankshafts are the perfect crank to complete a stout bottom end build. Each crankshaft is put through a multi-step heat treatment process and nitrided (hardened) for maximum strength. The crankshaft is then stress relieved, shot peened, and magnafluxed (stress tested). The center, crank pin and counterweights are gun drilled for reduced weight. Each Turbo Tuff crankshaft features knife-edged counterweights for proper balance and lowest rotational mass.  Specs: 4340 Billet For High Horsepower/High Boosted Applications Multi-step heat treatment process Nitrided, Stress Relieved and Shot Peened 100% Magnafluxed Knife-edged counterweights Gun drilled crank pin and counterweights