In Stock

-Multi-stepped design improves acceleration and enhances rideabilty.
-Works best for serious racers and riders.
-Excellent performance with stock or modified engines.
-Recommended to be used with Vortex EFI Interceptor and Pro Flow air cleaner kit.
-Power Gains: 7+HP Gain

Limited Lifetime Warranty:
DRI offers a LIFETIME WARRANTY against defects in materials and workmanship on all Fat Boy 4 systems sold. Warranty is for original purchaser only and is non-transferable. Each system is supplied with warranty registration card that must be read, signed and returned to DRI. See Warranty Card for more details