Why is it called the billet line? – All products in this series are made from SS310 stainless steel CNC-formed intermediate components! Blade – 48/60mm Turbine – Stage 1 (same specifications but with an extended wheel), Stage 2 (larger by 6 mm than the original factory version, and featuring 5+5 UHF impellers to further reduce exhaust back pressure). Rating 750whp Double ball bearings, reinforced shafts, and 8mm oversized balls ensure top-notch performance and protection for your high-performance vehicle! Each turbine undergoes rigorous VSR dynamic balancing to ensure its high-speed stability! Please note – the turbine in the illustration is stage 2. If you choose this option, please contact us to obtain your original factory-supplied turbine housing for replacement. The e-wastegate in the illustration is also not included.