Harley-Davidson FAT BOY LO Tuning
Genuine HD tuning and aftermarket alternatives that fit the FAT BOY LO — all years. Select your year for exact fitment and pricing.
Genuine Harley-Davidson (2)
Aftermarket alternatives
Aftermarket tuning that fit the FAT BOY LO. 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>