HPI-55D1-18B Big Bore Throttle Body
Black Friday price $580.86 26% off at checkout
- Free shipping on this part
- Returns and exchanges: see our policy
- Questions? Call 715-235-3659 or chat with us on the site.
Description
Cable Driven™ Big Bore Throttle Body – 55mm CNC Ported Intake System (Black)
Maximize Airflow, Horsepower & Torque for Harley-Davidson Twin Cam Models
Engineered for precision performance, the Cable Driven™ Big Bore Throttle Body with CNC ported intake manifold is designed to unleash the full potential of your Harley-Davidson Twin Cam engine. Flow bench-tested and dyno-proven, this throttle body system delivers substantial gains in airflow, horsepower, and torque while maintaining OEM compatibility and reliability. Constructed from CNC-machined aluminum and featuring a brass throttle blade for long-lasting accuracy, this intake system sets the standard for precision and performance — Made in the USA for riders who demand the best.
Key Features
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Complete performance system — includes throttle body, CNC ported intake manifold, cable bracket, flanges, and seals
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Flow bench-tested and dyno-proven to deliver measurable horsepower and torque gains
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Brass throttle blade resists deflection for superior throttle position accuracy
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Sealed double roller bearing ensures smooth, reliable throttle operation
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Compatible with all OEM electronics and cruise control systems
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Fully CNC machined and internally ported for maximum flow and precision fitment
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Stock bolt pattern and air cleaner opening for easy installation
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Made in the USA with high-grade aluminum construction
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Emissions-related part – not legal for sale or use in California on pollution-controlled vehicles
Performance & Fitment
The Cable Driven™ 55mm Big Bore Throttle Body is designed for Harley-Davidson Twin Cam-equipped Touring, Softail, and Dyna models. Built for riders who demand dyno-proven results, this upgrade optimizes airflow for big-inch or high-compression engines, improving throttle response and mid-to-top-end power. Perfect for custom performance baggers and tuned street builds featuring Nowaskey Suspension, Hofmann Designs carbon fiber, or billet aluminum components, this throttle body is precision-built for smooth power delivery and uncompromising reliability.
Bore Size: 55.00 mmModel: Cable Driven™
Color/Finish: Black
Material: CNC Machined Aluminum
Features: Intake Runner 1.80", Sealed Double Roller Bearing
Units: Each
Weight: 2.65 lbs
Dimensions (L x W x H): 9.42" x 6.54" x 6.37"
Country of Origin: Made in the USA
Not legal for sale or use in California on pollution-controlled vehicles
Fitment
- Fits Harley-Davidson Touring Models
- Fits Harley-Davidson Softail Models
- Fits Harley-Davidson Dyna Models
Not sure it fits your bike? Call 715-235-3659 or chat with us on the site and a tech can confirm it with you.
Specifications & Installation
| Brand | Drag Specialties |
|---|---|
| Part number | 106590 |
| Product type | throttle body 55mm |
| Bore Size | 55.00 mm |
| Model | Cable Driven™ |
| Color/Finish | Black |
| Material | CNC Machined Aluminum |
| Features | Intake Runner 1.80", Sealed Double Roller Bearing |
| Units | Each |
| Weight | 2.65 lbs |
| Dimensions (L x W x H) | 9.42" x 6.54" x 6.37" |
| Country of Origin | Made in the USA |
Videos
Want it installed right? Book the Nowaskey Speed Shop or call 715-235-3659.
Questions Riders Ask
Will this fit my bike?
This part is listed for:
- Fits Harley-Davidson Touring Models
- Fits Harley-Davidson Softail Models
- Fits Harley-Davidson Dyna Models
Save your bike with Shop by Bike and we check it for you. Not sure? Call or chat with us on the site and a tech can confirm it with you.
What's the part number?
Manufacturer part number 1022-0237. Our item number is 106590.
Can I install it myself?
Most riders with basic tools and a service manual can. The Specifications & Installation tab lists difficulty, time and guides where we have them. Prefer a pro install? Book a Speed Shop slot and call to check current availability.
Who do I talk to after I buy?
Our techs. Call 715-235-3659 or chat with us on the site and you will reach the people who know these parts.
Still have a question? Call 715-235-3659 or chat with us on the site.
Premium Performance Parts
Race-proven suspension, front ends and brakes we stand behind
Track-proven Performance
Nowaskey Extreme Performance is a Harley-Davidson suspension and performance shop in Menomonie, Wisconsin. We design our own shocks, fork cartridges and front-end packages, test them in King of the Baggers racing, and back Nowaskey-brand products with a lifetime warranty.
Every setup is matched to your bike, your weight and the way you ride.