Thrasher Kits for Stock Harley-Davidson Motorcycles

Call 800-841-STAR or E-mail for more information.

Our Thrasher series, engine packages are the most powerful and reliable available.


  • For 1999-2006 Harley-Davidson Models

  • One Stop Shop

  • The machine work is performed on YOUR heads & cylinders.

  • A stock twin cam Harley has around 64 horsepower and about 75 foot pounds of torque. 

  • The Star Racing Thrasher Kit increases the horsepower on average to 118+ and the torque to 100 foot pounds. 

  • Since 1980, Star Racing has been dedicated to providing its customers with the best in motorcycle performance and reliability and is pleased to announce the availability of the Thrasher Kit for your 1999 to 2006 twin cam Harley®. 

  • This kit is a Star exclusive that increases the performance of your motorcycle while maintaining the stock appearance and reliability.

  • The Star Power Thrasher Kit has been designed to work with the stock clutches, starters, and all other Harley Davidson parts while maintaining ease of drivability and running on today’s pump gas.

  • Before and after dyno runs are performed on each bike so you may monitor the progress in performance. 

  • This means you not only feel the power, you can see it too!


Call 800-841-7827 to make an appointment.


Included in the package:

  • Heads - Pro Ported & Machined

  • Oversized Valves - Intake & Exhaust

  • Custom Cams

  • CP forged Pistons

  • Cylinders Bored & Honed with torque plates

  • Cam Bearings

  • 58mm Throttle Body

  • S&S Adjustable Push Rods

  • MLS Gaskets 

  • All Necessary Hardware & Fluids

  • FireCore Wires

  • Complete Labor

  • Before & After Dyno

Turn Key $5,795



 Options to add to your Package:

Boarzilla Exhaust............starting at $1,200

TTS Tuner............$440

Bigger, Better Air Cleaner.............$399

These are options that work best with our Packages.

We have these as options because some folks already have these items. 

We use the TTS tuner or the Screaming Eagle Tuner.

Email for more info and details.

Turn around time is typically 3-4 weeks for our Thrasher kits depending on shop workload, so you will be back on the road in no time!


WARRANTY - Star Power makes no warranty, expressed or implied, as to the products sold, manufactured, or imported by us, including without limitation any warranties or merchantability and fitness for a particular purpose. These parts are designed for racing only; use them at your own risk.

YOUR COMPLETE SATISFACTION IS OUR GOAL – Most performance parts are designed for off highway use only and may not be legal for use on public streets, roads, or highways. Performance parts are inherently short lived and must be inspected regularly to prevent untimely failure and/or damage. Any new or modified parts, or any services provided by Star Power (or which are sold through Star Power) are sold as performance parts and are sold as is with no warranty, unless specified by the individual manufacturer.