Fat Boy 4

FB4-EH4000

Duncan Racing Fat Boy 4 Complete Exhaust System Honda 400EX - FB4-EH4000

EAN: 5053380233921

Air Filters

20% HP Gain peak
20 bike length gain in a 300 yard acceleration run, average
100" wall aluminum extrusion muffler body
Polished by special order

Performance: 20% HP Gain peak; 20 bike length gain in a 300 yard acceleration run, average. Other Required modifications: K&N Air Filter, Carburetor Re-Jetting or Vortex ECU (whichever applies). CNC Bent 304 stainless steel headers, mid-pipes and tail sections. Standard finish; bright finish. CNC machined stainless steel header flanges.Custom designed .100" wall aluminum extrusion muffler body. Standard finish satin. Polished by special order. Front and Rear End Caps CNC machined from 6061 billet aluminum. Muffler mounts CNC machined from single piece of 6061 billet aluminum. Attached to muffler body by heli-arc weld.O-Ring Seal at tail pipe to muffler joint.All mufflers completely rebuild able and repack able. Stainless muffler cores.Optional (at additional cost) Bolt On Turndown; redirects exhaust fumes and noise toward the ground. Also required for use with spark arrestor. Attaches with 4 stainless screws (supplied) and has O-Ring seal.All systems are individually marked with their own serial number.Complete DRI Technical phone support for installation and carburetor jetting questions.

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