Building the hot side for a high-horsepower single-turbo setup is usually the most time-consuming part of a turbo project. You spend hours cutting, tacking, and welding complex merge collectors, trying to squeeze two massive exhaust pipes into a single T4 or T6 flange without ruining the flow. It is a fabrication nightmare that often results in compromised packaging. HPT Turbochargers walked into PRI 2025 with a solution that eliminates the merge collector entirely. Their new F5 Dual-Entry Turbos feature a turbine housing designed to accept two separate exhaust feeds, simplifying the plumbing while drastically improving response.
The design was impressive enough to earn a Featured Product Showcase Award, but the real value is in the physics. In a traditional setup, merging the exhaust banks creates turbulence and disrupts the natural pulses of the engine. Harry Hruska, the CEO of HP Race Brands, explained that the new housing kept the banks separate right up to the turbine wheel. This allowed the exhaust pulses to hit the wheel twice per revolution instead of once. Hruska called it a “double-hit” effect. By delivering that energy more uniformly, the turbo spools significantly faster, and the system sees reduced backpressure compared to a standard merged setup. It brought the kind of transient response you usually only see in twin-turbo applications to a single-turbo package.
From a builder’s perspective, the V-band inlet design is a time-saver. It allows you to route pipes around steering shafts, frame rails, and suspension components without having to neck everything down into a bulky collector. The housing features a 1.15 A/R ratio, which sits in the sweet spot for high-RPM flow without killing low-end torque. Hruska noted that while the current F5-series compressor options will support over 3,000 horsepower, the turbine housing itself flowed enough air to support 4,000 horsepower. That means you can build the kit once and upgrade the compressor side later as your program gets faster.
The F5 platform also integrates HPT’s Quick Spool Technology and uses robust dual ball bearings to handle the abuse of drag racing. Whether you are building a street car that needs to be responsive or a dedicated track weapon hunting for six-second timeslips, these Dual-Entry Turbos offer a rare combination of packaging flexibility and raw efficiency.
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