Fatboy

FB4-ESZ400_exhaust

Duncan Racing Fat Boy 4 Full Exhaust Pipe Muffler Z400 08 09 2010 FB4-ESZ400

EAN: 0745495803247

UPC: 745495803247

Complete Systems

All Fat Boy 4 Exhaust Systems come with a FREE jet kit (for stock carburetor) included with instruction packet.
DRI offers a LIFETIME WARRANTY against defects in materials and workmanship on all Fat Boy 4 systems sold.
Performance: 22% HP Gain peak; 21 bike length gain in a 300 yard acceleration run, average.

Fat Boy 4 Complete Exhaust Suzuki LTZ 400/KFX400. All Fat Boy 4 Exhaust Systems come with a FREE jet kit (for stock carburetor) included with instruction packet. DRI offers a LIFETIME WARRANTY against defects in materials and workmanship. Each system is supplied with warranty registration card that must be read, signed and returned to DRI. Other Required modifications: Pro Flow Air Cleaner with K&N Air Filter, Carburetor Re-Jetting. Larger C/S sprocket advisable in hard pack terrain or on with 18" tires. Performance: 22% HP Gain peak; 21 bike length gain in a 300 yard acceleration run, average. Outstanding throttle response and excellent midrange pull. Fat Boy 4 4-Stroke Power Exhausts are a proprietary product of Duncan Racing International, Inc. DRI is the sole manufacture and developer of this product. DRI has designed this product to be the top ATV 4-Stroke exhaust on the market. Fat Boy 4 Features: 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 rebuildable and repackable. Stainless muffler cores. All systems are individually marked with their own serial number. Complete DRI Technical phone support for installation and carburetor jetting questions. Fat Boy 4 HQ Muffler Features: 25% More Packing than Standard Fat Boy 4 Muffler. Core and Packing are Specially Designed to Reduce Noise. 20%-30% Lighter than Stock Exhaust (varies with model). 99-97dB Noise Output, 2-3dB Quieter than Standard Fat Boy 4 (varies with model). Comes with Turndown and Spark Arresting Screen.

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