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2018 Harley-Davidson Fat Bob 107 with Stage I Upgrades Dyno

Screamin’ Eagle performance mods

The 2018 Harley-Davidson Softail Fat Bob has a starting suggested retail price of $16,999 and is available in five colors, Vivid Black, Black Denim, Red Iron Denim, Bonneville Salt Denim or Industrial Gray Denim. Powering this American machine is an air-cooled, single cam driven, 107ci v-twin.

Our Fat Bob got some performance upgrades from Screamin’ Eagle. We installed their Satin Black Street Cannon Mufflers, paired with their Satin Black 4.5” end caps (sold separately) along with their High-Flow Air Cleaner Kit with Ratchet Round Cover (sold separately). To tie it all together we used their Pro Street Tuner to remap the ECU.

The Screamin Eagle Pro Street Tuner

The Screamin’ Eagle Pro Street Tuner

Screamin' Eagle

Screamin Eagle High-Flow Air Cleaner and Ratchet Round Cover

Screamin’ Eagle High-Flow Air Cleaner and Ratchet Round Cover (Cover Sold Separately)

Screamin' Eagle

We ran the Fat Bob with the Stage I upgrades on our rear-wheel dyno in fourth gear to determine peak output from the hopped-up v-twin. We documented 83.59 hp at 5,200 rpm and 102.43 pound-feet of torque at 3,240 rpm.

2018 HD Fat Bob with Stage I Upgrades Dyno Chart

2018 HD Fat Bob with Stage I Upgrades Dyno Chart

Jon McDevitt

Compared to the stock, the Stage I version produced 9.39 more hp and 2.04 additional pound-feet of torque.