Max Flow™ Throttle Body – Black – Twin Cam 58 mm

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