This is for CVO® owners who want to lead the pack!  Our Muscle 110 Extreme kit is a combination of the right mix of components and modifications that extracts stunning horsepower and torque from the CVO 110 platform.  Our goal was to break the 150 horsepower barrier on pump gas without creating a narrow power curve that detracts from the riding experience.  The Muscle 110 Extreme delivers, with torque breaking 100 ft/lbs from 2,750 rpm through red line, peaking at 130 ft/lbs – turning your CVO® into a Rocket Ship!

Powerful components supplied with this kit include our proprietary 26cc dome high compression pistons fitted to your cylinders to provide the squeeze necessary to generate this kind of power.  Valve action is provided by our Red Shift 687 cam, Pro-Taper pushrods and 1.725:1 roller rocker arms, yielding .730″ lift at the valve.  Our Stage III CNC headwork is performed on your CVO® heads, with valve springs upgraded to reliably handle this high lift.  In the cam chest, a blueprinted billet cam plate, high volume oil pump and Red Shift dual-piston cam chain tensioners control critical oil flow and valve train stability.

Externally, your factory throttle body electronic components are installed in a Horsepower Inc 62/64mm Max Flow throttle body fitted with high flow injectors and Zipper’s Premium air cleaner assembly.  Engine management is handled by ThunderMax with AutoTune, loaded with a Zipper’s-developed map to ensure you can hit the ground riding instead of having to develop a custom map.  An included high voltage coil and wire package guarantees you have the high energy spark needed to make big power.

This package is for the rider wanting serious power.  To make and maintain this kind of output and the type of riding that it promotes, other areas of your engine and motorcycle will need related performance modifications.  The engine lower end should have the crankshaft blueprinted and output shaft bearing converted to the stronger Timken® design. The clutch will require an upgrade and the rear drive converted from belt to chain for strength.  An exhaust system designed to support this output should be used (a D&D Boarzilla was used during our development of this kit).

The Muscle 110 Extreme kit is a no-nonsense hot rod package that delivers thrilling power across the RPM range.  Every effort has been made to make this kit reliable for regular road use on standard high-test pump fuel, with cranking compression set to 220.



Zipper’s Muscle 110″ Extreme Kit for 2008-Up CVO Models


Not legal for sale or use in California on any pollution controlled motor vehicle.
Not legal for sale or use on any EPA pollution controlled motor vehicle.

*To ensure you enjoy a premium experience, Please fill out a Build Sheet/Job Order Sheet prior to completing an order on the website.
Click here for Zipper’s Build Sheet/Job Order Sheet

Weight 1 lbs
Emissions Compliant

Country of Origin

Engine Type


Fuel / Air



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