K&N Powersports Air Intakes for the Harley Davidson FLSTFI Fat Boy F/I

Harley Davidson FLSTFI Fat Boy F/I Powersports Air Intakes

Buy now from the K&N Store and get a 100% money back guarantee & free shipping on any powersports air intake!
  • Designed to increase power and torque
  • K&N Million Mile Limited Warranty®
  • Replaces restrictive factory air intake system
  • Easy to install performance
Add more horsepower to your Harley Davidson FLSTFI Fat Boy F/I with a K&N powersports air intake.
K&N Performance Air Intake Systems
Vehicle DescriptionProductPart Number Product Image
2006 Harley Davidson FLSTFI Fat Boy F/I 88 CI - O-Ring Kit for SS-171
Motorcycle
Accessory Air Intake SS-002 Get Pricing and Buy SS-002 FLSTFI Fat Boy F/I Accessory Air Intake
2006 Harley Davidson FLSTFI Fat Boy F/I 88 CI - 1-5/8 inch tall filter
Motorcycle
Custom Assembly Air Intake RK-3909-1

Est. Power Gain
6.05 HP @ 5206 RPM
Get Pricing and Buy RK-3909-1 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2006 Harley Davidson FLSTFI Fat Boy F/I 88 CI - 2-1/4 in tall filter
Motorcycle
Custom Assembly Air Intake RK-3910-1

Est. Power Gain
10.76 HP @ 5206 RPM
Get Pricing and Buy RK-3910-1 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2006 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3932

Est. Power Gain
7.16 HP @ 5206 RPM
Get Pricing and Buy RK-3932 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2006 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3933

Est. Power Gain
7 HP @ 5204 RPM
Get Pricing and Buy RK-3933 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2006 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3934

Est. Power Gain
10.23 HP @ 5155 RPM
Get Pricing and Buy RK-3934 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2006 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3935

Est. Power Gain
11.57 HP @ 5203 RPM
Get Pricing and Buy RK-3935 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2006 Harley Davidson FLSTFI Fat Boy F/I 88 CI - Exc. lower fairings
Motorcycle
Aircharger Air Intake 63-1125

Est. Power Gain
7.78 HP @ 4953 RPM
Get Pricing and Buy 63-1125 FLSTFI Fat Boy F/I Aircharger Air Intake
2006 Harley Davidson FLSTFI Fat Boy F/I 88 CI - Exc. lower fairings
Motorcycle
Aircharger Air Intake 63-1125P

Est. Power Gain
7.78 HP @ 4953 RPM
Get Pricing and Buy 63-1125P FLSTFI Fat Boy F/I Aircharger Air Intake
2005 Harley Davidson FLSTFI Fat Boy F/I 88 CI - O-Ring Kit for SS-171
Motorcycle
Accessory Air Intake SS-002 Get Pricing and Buy SS-002 FLSTFI Fat Boy F/I Accessory Air Intake
2005 Harley Davidson FLSTFI Fat Boy F/I 88 CI - 1-5/8 inch tall filter
Motorcycle
Custom Assembly Air Intake RK-3909-1

Est. Power Gain
6.05 HP @ 5206 RPM
Get Pricing and Buy RK-3909-1 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2005 Harley Davidson FLSTFI Fat Boy F/I 88 CI - 2-1/4 in tall filter
Motorcycle
Custom Assembly Air Intake RK-3910-1

Est. Power Gain
10.76 HP @ 5206 RPM
Get Pricing and Buy RK-3910-1 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2005 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3932

Est. Power Gain
7.16 HP @ 5206 RPM
Get Pricing and Buy RK-3932 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2005 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3933

Est. Power Gain
7 HP @ 5204 RPM
Get Pricing and Buy RK-3933 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2005 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3934

Est. Power Gain
10.23 HP @ 5155 RPM
Get Pricing and Buy RK-3934 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2005 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3935

Est. Power Gain
11.57 HP @ 5203 RPM
Get Pricing and Buy RK-3935 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2005 Harley Davidson FLSTFI Fat Boy F/I 88 CI - Exc. lower fairings
Motorcycle
Aircharger Air Intake 63-1125

Est. Power Gain
7.78 HP @ 4953 RPM
Get Pricing and Buy 63-1125 FLSTFI Fat Boy F/I Aircharger Air Intake
2005 Harley Davidson FLSTFI Fat Boy F/I 88 CI - Exc. lower fairings
Motorcycle
Aircharger Air Intake 63-1125P

Est. Power Gain
7.78 HP @ 4953 RPM
Get Pricing and Buy 63-1125P FLSTFI Fat Boy F/I Aircharger Air Intake
2004 Harley Davidson FLSTFI Fat Boy F/I 88 CI - O-Ring Kit for SS-171
Motorcycle
Accessory Air Intake SS-002 Get Pricing and Buy SS-002 FLSTFI Fat Boy F/I Accessory Air Intake
2004 Harley Davidson FLSTFI Fat Boy F/I 88 CI - 1-5/8 inch tall filter
Motorcycle
Custom Assembly Air Intake RK-3909-1

Est. Power Gain
6.05 HP @ 5206 RPM
Get Pricing and Buy RK-3909-1 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2004 Harley Davidson FLSTFI Fat Boy F/I 88 CI - 2-1/4 in tall filter
Motorcycle
Custom Assembly Air Intake RK-3910-1

Est. Power Gain
10.76 HP @ 5206 RPM
Get Pricing and Buy RK-3910-1 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2004 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3932

Est. Power Gain
7.16 HP @ 5206 RPM
Get Pricing and Buy RK-3932 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2004 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3933

Est. Power Gain
7 HP @ 5204 RPM
Get Pricing and Buy RK-3933 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2004 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3934

Est. Power Gain
10.23 HP @ 5155 RPM
Get Pricing and Buy RK-3934 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2004 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3935

Est. Power Gain
11.57 HP @ 5203 RPM
Get Pricing and Buy RK-3935 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2004 Harley Davidson FLSTFI Fat Boy F/I 88 CI - Exc. lower fairings
Motorcycle
Aircharger Air Intake 63-1125

Est. Power Gain
7.78 HP @ 4953 RPM
Get Pricing and Buy 63-1125 FLSTFI Fat Boy F/I Aircharger Air Intake
2004 Harley Davidson FLSTFI Fat Boy F/I 88 CI - Exc. lower fairings
Motorcycle
Aircharger Air Intake 63-1125P

Est. Power Gain
7.78 HP @ 4953 RPM
Get Pricing and Buy 63-1125P FLSTFI Fat Boy F/I Aircharger Air Intake
2003 Harley Davidson FLSTFI Fat Boy F/I 88 CI - O-Ring Kit for SS-171
Motorcycle
Accessory Air Intake SS-002 Get Pricing and Buy SS-002 FLSTFI Fat Boy F/I Accessory Air Intake
2003 Harley Davidson FLSTFI Fat Boy F/I 88 CI - 1-5/8 inch tall filter
Motorcycle
Custom Assembly Air Intake RK-3909-1

Est. Power Gain
6.05 HP @ 5206 RPM
Get Pricing and Buy RK-3909-1 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2003 Harley Davidson FLSTFI Fat Boy F/I 88 CI - 2-1/4 in tall filter
Motorcycle
Custom Assembly Air Intake RK-3910-1

Est. Power Gain
10.76 HP @ 5206 RPM
Get Pricing and Buy RK-3910-1 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2003 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3932

Est. Power Gain
7.16 HP @ 5206 RPM
Get Pricing and Buy RK-3932 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2003 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3933

Est. Power Gain
7 HP @ 5204 RPM
Get Pricing and Buy RK-3933 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2003 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3934

Est. Power Gain
10.23 HP @ 5155 RPM
Get Pricing and Buy RK-3934 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2003 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3935

Est. Power Gain
11.57 HP @ 5203 RPM
Get Pricing and Buy RK-3935 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2003 Harley Davidson FLSTFI Fat Boy F/I 88 CI - Exc. lower fairings
Motorcycle
Aircharger Air Intake 63-1125

Est. Power Gain
7.78 HP @ 4953 RPM
Get Pricing and Buy 63-1125 FLSTFI Fat Boy F/I Aircharger Air Intake
2003 Harley Davidson FLSTFI Fat Boy F/I 88 CI - Exc. lower fairings
Motorcycle
Aircharger Air Intake 63-1125P

Est. Power Gain
7.78 HP @ 4953 RPM
Get Pricing and Buy 63-1125P FLSTFI Fat Boy F/I Aircharger Air Intake
2002 Harley Davidson FLSTFI Fat Boy F/I 88 CI - O-Ring Kit for SS-171
Motorcycle
Accessory Air Intake SS-002 Get Pricing and Buy SS-002 FLSTFI Fat Boy F/I Accessory Air Intake
2002 Harley Davidson FLSTFI Fat Boy F/I 88 CI - 1-5/8 inch tall filter
Motorcycle
Custom Assembly Air Intake RK-3909-1

Est. Power Gain
6.05 HP @ 5206 RPM
Get Pricing and Buy RK-3909-1 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2002 Harley Davidson FLSTFI Fat Boy F/I 88 CI - 2-1/4 in tall filter
Motorcycle
Custom Assembly Air Intake RK-3910-1

Est. Power Gain
10.76 HP @ 5206 RPM
Get Pricing and Buy RK-3910-1 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2002 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3932

Est. Power Gain
7.16 HP @ 5206 RPM
Get Pricing and Buy RK-3932 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2002 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3933

Est. Power Gain
7 HP @ 5204 RPM
Get Pricing and Buy RK-3933 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2002 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3934

Est. Power Gain
10.23 HP @ 5155 RPM
Get Pricing and Buy RK-3934 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2002 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3935

Est. Power Gain
11.57 HP @ 5203 RPM
Get Pricing and Buy RK-3935 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2002 Harley Davidson FLSTFI Fat Boy F/I 88 CI - Exc. lower fairings
Motorcycle
Aircharger Air Intake 63-1125

Est. Power Gain
7.78 HP @ 4953 RPM
Get Pricing and Buy 63-1125 FLSTFI Fat Boy F/I Aircharger Air Intake
2002 Harley Davidson FLSTFI Fat Boy F/I 88 CI - Exc. lower fairings
Motorcycle
Aircharger Air Intake 63-1125P

Est. Power Gain
7.78 HP @ 4953 RPM
Get Pricing and Buy 63-1125P FLSTFI Fat Boy F/I Aircharger Air Intake
2001 Harley Davidson FLSTFI Fat Boy F/I 88 CI - O-Ring Kit for SS-171
Motorcycle
Accessory Air Intake SS-002 Get Pricing and Buy SS-002 FLSTFI Fat Boy F/I Accessory Air Intake
2001 Harley Davidson FLSTFI Fat Boy F/I 88 CI - 1-5/8 inch tall filter
Motorcycle
Custom Assembly Air Intake RK-3909-1

Est. Power Gain
6.05 HP @ 5206 RPM
Get Pricing and Buy RK-3909-1 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2001 Harley Davidson FLSTFI Fat Boy F/I 88 CI - 2-1/4 in tall filter
Motorcycle
Custom Assembly Air Intake RK-3910-1

Est. Power Gain
10.76 HP @ 5206 RPM
Get Pricing and Buy RK-3910-1 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2001 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3932

Est. Power Gain
7.16 HP @ 5206 RPM
Get Pricing and Buy RK-3932 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2001 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3933

Est. Power Gain
7 HP @ 5204 RPM
Get Pricing and Buy RK-3933 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2001 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3934

Est. Power Gain
10.23 HP @ 5155 RPM
Get Pricing and Buy RK-3934 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2001 Harley Davidson FLSTFI Fat Boy F/I 88 CI - All
Motorcycle
Custom Assembly Air Intake RK-3935

Est. Power Gain
11.57 HP @ 5203 RPM
Get Pricing and Buy RK-3935 FLSTFI Fat Boy F/I Custom Assembly Air Intake
2001 Harley Davidson FLSTFI Fat Boy F/I 88 CI - Exc. lower fairings
Motorcycle
Aircharger Air Intake 63-1125

Est. Power Gain
7.78 HP @ 4953 RPM
Get Pricing and Buy 63-1125 FLSTFI Fat Boy F/I Aircharger Air Intake
2001 Harley Davidson FLSTFI Fat Boy F/I 88 CI - Exc. lower fairings
Motorcycle
Aircharger Air Intake 63-1125P

Est. Power Gain
7.78 HP @ 4953 RPM
Get Pricing and Buy 63-1125P FLSTFI Fat Boy F/I Aircharger Air Intake

K&N replacement air filters can help your car or truck run better.