Horsepower Inc. Max Flow™ Throttle Body – Black – Twin Cam 58 mm

$884.95

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Horsepower Inc. Max Flow™ Throttle Body – Black – Twin Cam 58 mm

$884.95

Horsepower Inc. Max Flow™ 58 mm Throttle Body for Harley-Davidson Twin Cam Engines

Unlock your Twin Cam’s full potential with the HPI Max Flow™ Throttle Body – 58 mm, precision-engineered for maximum horsepower and smooth throttle response. This premium billet aluminum upgrade is designed to handle the airflow demands of high-performance and large-displacement engines while maintaining OEM fitment and compatibility.

Every unit is CNC-machined, internally ported, and fitted with a sealed double roller bearing for reliable, precise throttle operation. The large plenum intake design improves airflow velocity and power delivery, especially in the mid- and high-RPM range.

Proudly Made in the USA, this throttle body offers dyno-proven results and unmatched quality for riders serious about performance.

Key Features

  • Direct OEM Replacement: Fully replaces factory throttle body and manifold — retains OEM sensors and compatibility.

  • Precision Engineering: CNC-machined from billet aluminum with sealed double roller bearings for smooth control.

  • Maximized Airflow: 58 mm bore and large plenum design optimized for mid-range and top-end power.

  • Fully Ported Interior: Enhances throttle response and volumetric efficiency.

  • Performance-Built: Ideal for large cubic-inch or high-output Twin Cam motors.

  • Made in the USA: Built by performance experts for serious Harley-Davidson tuners.

Fitment – Harley-Davidson Twin Cam Models

Fits the following Harley-Davidson® Twin Cam models (2001–2005):

Touring Models:

  • FLTRI Road Glide (2002–2005)

  • FLHRI Road King (2002–2005)

  • FLHRCI Road King Classic (2002–2005)

  • FLHTI Electra Glide Standard (2003–2005)

  • FLHTCI Electra Glide Classic (2002–2005)

  • FLHTCUI Electra Glide Ultra Classic (2002–2005)

Softail Models:

  • FLSTFI Fat Boy (2002–2005)

  • FLSTCI Heritage Softail Classic (2001–2005)

  • FLSTNI Softail Deluxe (2005)

  • FXSTI Softail Standard (2001–2005)

  • FXSTDI Softail Deuce (2001–2005)

  • FXSTBI Night Train (2001–2005)

  • FXSTSI Springer Softail (2001–2005)

  • FLSTSI Heritage Springer (2001–2003)

Dyna Models:

  • FXDI Dyna Super Glide (2004–2005)

  • FXDLI Dyna Low Rider (2004–2005)

  • FXDWGI Dyna Wide Glide (2004–2005)

  • FXDXI Dyna Super Glide Sport (2004–2005)

  • FXDCI Super Glide Custom (2005)

Fitment based on stock configurations. Not legal for sale or use in California on pollution-controlled vehicles.

Technical Specifications

  • Product Name: Throttle Body

  • Model: Max Flow™

  • Type: Single Bore Throttle Body

  • Bore Size: 58 mm

  • Material: Billet Aluminum

  • Color/Finish: Black Anodized

  • Features: Internally Ported / Sealed Roller Bearing / 1.80″ Intake Runner

  • Compatibility: Twin Cam Engines (2001–2005)

  • Units: Each

  • Riding Style: Street / Performance / Touring

  • Made in: USA

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