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News from Zipper's Performance
Oct 2009
Add 7 More Cubes Without Breaking the Bank

Turn your "Sleepy" 96 inch engine into a "Sleeper" 103 incher!

Cylinders (supplied on an exchange basis) are precision bored and honed on torque plates from 3-3/4" to 3-7/8" and fitted with forged pistons. Red Shift cams and adjustable pushrods let the engine breathe for a substantial increase in usable torque and horsepower. A complete top end and cam change gasket set included.

Two versions are available. 517-300 is the best choice for lighter FX-style bikes (Dynas® and Softails®), includes flat-top pistons and Red Shift 577 cams. 517-301 includes dished (-11cc) pistons and Red Shift 575 cams for earlier torque delivery and lower temperatures in heavier Touring bike applications.
Biggest bang for the buck - only $1,029.95 with exchange cylinders!


Cylinder/piston kits available separately.

Expert installation of this product is available at Zipper's facility in Elkridge, Maryland. Transportation of your motorcycle to and from Zipper's can be arranged if desired. Please contact Zipper's Performance Products for details.

Part No. - Description
#517-300B - Sleeper Kit, '07-'10 FX Big Twins, Black
#517-300S - Sleeper Kit, '07-'10 FX Big Twins, Silver
#517-301B - Sleeper Kit, '07-'10 FL Big Twins, Black
#517-301S - Sleeper Kit, '07-'10 FL Big Twins, Silver




Put It All Together with ThunderMax
ThunderMax makes installing performance kits on EFI Harley-Davidson® models easy. Add the Sleeper 103" Kit to your bike, then install the ThunderMax - all you do is load a map and ride!

Click Here to View ThunderMax Customer Testimonials
View More ThunderMax videos on You Tube: Click Here
Contact Zippers Performance Products by phone, email or visit on-line!
Phone: (410) 579-2828
Email: Zippers@ZippersPerformance.com
Web: www.ZippersPerformance.com

Legal for sale in the State of California only for racing vehicles which may never be used upon a highway.
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Zipper's Performance Products | 6655-A Amberton Drive | Elkridge | MD | 21075