Horsepower Inc. Max Flow™ 58 mm Throttle Body – Black – For Harley-Davidson Twin Cam (2006–2017)
The Horsepower Inc. (HPI) Max Flow™ 58 mm Throttle Body is built to deliver exceptional airflow and throttle response for Harley-Davidson® Twin Cam engines. Designed and manufactured in the USA, this high-performance throttle body offers precise fitment, durable construction, and dyno-proven results.
Machined from billet aluminum and internally ported for maximum flow, the Max Flow™ is ideal for big-bore Twin Cam builds and high-output applications. Its 1.80" intake runner and large plenum design optimize volumetric efficiency, improving horsepower and torque across the RPM range.
With a sealed double roller bearing for smooth throttle actuation and direct OEM compatibility, this throttle body combines race-level performance with factory-level reliability — all backed by American craftsmanship.
Key Features
Direct OEM Replacement: Fully replaces stock throttle body and manifold; compatible with factory components and sensors.
Precision-Machined Construction: CNC-cut from billet aluminum for strength and accuracy.
High-Flow Engineering: 58 mm bore with internal porting and a large plenum for maximum mid- and top-end power.