The ATJ High Helix Impeller 
"The High-Helix Impeller was originally designed by Duane at Hi-Tech Performance Inc., with high-horsepower applications in mind. After prototyping and testing, the High-Helix (HH) impeller was handed off to Ronnie at American Turbine for production. The final product, crafted from durable 17-4 stainless steel, delivers unparalleled performance. Utilizing advanced SolidWorks 3D CAD design and rigorous testing, the HH impeller minimizes cavitation during launch, resulting in superior acceleration, and maximizes top-end efficiency.
Key Advantages:
 * Reduced Cavitation: Experience significantly improved acceleration from a standstill.
 * Enhanced Top-End Efficiency: Achieve optimal performance at high speeds.
 * Power Adder Optimized: Ideal for turbocharged, supercharged, or nitrous-assisted engines.
 * Improved Intake Performance: Proven to boost performance in boats with restricted intake openings.
 * Robust Construction: Made from high-strength 17-4 stainless steel for lasting durability.
Proven Results:
Harrison Stepp achieved remarkable performance with the 9.5" HH impeller in a twin-turbo BBC, single carburetor setup:
 * 7800 RPM at 47 PSI
 * 3.52 seconds @ 151 MPH
 * 3.73 seconds @ 146 MPH
Note: The High-Helix impeller is optimized for applications exceeding 600 horsepower.
Available Sizes: 9.00", 9.25", and 9.50"
The HH Impeller is a must for boats with turbos and blowers.  The HH has larger windows than a standard impeller allowing the HH to move more water at any RPM.  We keep impellers in stock for Dominator, Berkeley, and American Turbine. More options and half sizes are also available call 417-858-8616 for more information.