Horsepower Inc. Max Flow™ 58 mm Throttle Body – Black – for Harley-Davidson Twin Cam (1.76" Intake Runner, 2006-2017)

Take your Twin Cam’s performance to the next level with the Horsepower Inc. Max Flow™ 58 mm Throttle Body.
Designed and precision-machined in the USA, this billet-aluminum throttle body is built for high-displacement Twin Cam engines that demand superior airflow and throttle response.

The 1.76-inch intake runner and internally-ported plenum are engineered to deliver exceptional mid- and top-end power without compromising low-speed torque. With sealed double-roller bearings for buttery-smooth throttle operation and a direct-fit bolt-on design, it’s the perfect upgrade for riders chasing efficient power delivery and crisp performance.

Key Features

• High-Flow 58 mm Design: Improves cylinder fill and throttle response across the entire RPM range.

• Fully Machined Billet Aluminum: Precision CNC-cut for strength, stability, and consistent airflow.

• Internally Ported & Polished: Eliminates turbulence for maximum efficiency and horsepower gains.

• 1.76-Inch Intake Runner: Optimized for balance between torque and high-RPM output.

• Smooth Throttle Action: Sealed double-roller bearing ensures reliable, repeatable throttle feel.

• Direct OEM Compatibility: Bolts directly to stock manifold and sensors; no modifications required.

• Made in the USA: Hand-crafted to exact performance standards by Horsepower Inc.

Fitment – Harley-Davidson Twin Cam (2006 – 2017)

Touring Models:

• FLHR Road King (2007)

• FLHRS Road King Custom (2007)

• FLHX Street Glide (2006 – 2007)

• FLTR Road Glide (2006 – 2007)

• FLHT Electra Glide Standard (2006 – 2007)

• FLHTC Electra Glide Classic (2006 – 2007)

• FLHTCU Electra Glide Ultra Classic (2006 – 2007)

Softail Models:

• FLSTC Heritage Softail Classic (2006 – 2015)

• FLSTF Fat Boy (2006 – 2015)

• FLSTN Softail Deluxe (2006 – 2015)

• FLSTFB Fat Boy Lo (2010 – 2015)

• FLSTSB Cross Bones (2008 – 2011)

• FXSB Breakout (2013 – 2015)

• FXS Blackline (2011 – 2013)

• FLS Softail Slim (2012 – 2015)

• FLD Switchback (2012 – 2016)

• FXSTC Softail Custom (2007 – 2010)

• FXSTB Night Train (2007 – 2009)

• FXSTD Softail Deuce (2007)

Dyna Models:

• FXDB Street Bob (2006 – 2017)

• FXDC Super Glide Custom (2007 – 2014)

• FXDI Dyna Super Glide (2006 – 2010)

• FXDL Dyna Low Rider (2007 – 2009, 2015 – 2017)

• FXDWG Dyna Wide Glide (2007 – 2008, 2010 – 2017)

• FXDF Fat Bob (2008 – 2017)

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

Technical Specifications