Harley-Davidson FAT BOY Tuning
Genuine HD tuning and aftermarket alternatives that fit the FAT BOY — all years. Select your year for exact fitment and pricing.
Select your year for exact fitment & prices
Genuine Harley-Davidson (3)
Aftermarket for your FAT BOY
Confirmed to fit your FAT BOY
Aftermarket tuning the supplier lists against the FAT BOY. Genuine Harley-Davidson is listed above, not here.
Diag4Bike
TUNING LICENSE FOR DIAG-4-BIKE
Daytona Twin Tec
WEGO III WIDE-BAND AIR-FUEL RATIO TUNING AID
Diag4Bike
DIAG-4-BIKE SERIAL DIAGNOSTIC & FLASH TUNING
S&S
Single-Bore Manifold<br><ul><li>Designed for riders seeking the greatest possible performance gains from their fuel-injected engines</li><li>For maximum tunability and performance gains an S&amp;S Variable Fuel-Injection (VFI) module is recommended (sold separately), but any compatible, programmable module with enough capability and tuning range can be used</li><li>Components must be purchased separately to complete a Single-Bore EFI assembly</li><li>Made in the U.S.A.</li><li>Appropriate air cleaner kit must be ordered separately</li></ul>
S&S
Super G Carburetor with Stealth Air Cleaner Kit<br><ul><li>Adjustable accelerator pump for quick throttle response and easy starting</li><li>Use of the factory dual cable system ensures safe operation</li><li>Increases fuel and air flow for added performance</li><li>Variable position enrichment starting system</li><li>Teardrop style air cleaner cover included</li><li>O-ring sealed idle mixture screw</li><li>Washable, reusable filter element</li><li>Easy Installation and tuning</li><li>Made in the USA</li></ul>