Fatboy

FB4-EY3500_exhaust

Duncan Racing Fat Boy 4 Full Exhaust Pipe Warrior 87 88 89 90 91 92 FB4-EY3500

EAN: 0745495803278

UPC: 745495803278

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: 15% HP Gain peak; 15 bike length gain in a 300 yard acceleration run, average.

Yamaha Warrior 350- Fat Boy 4 Complete Exhaust. 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. 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. No HQ muffler is available for this model. Other Required modifications: 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: 15% HP Gain peak; 15 bike length gain in a 300 yard acceleration run, average. 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; brite finish. CNC machined stainless steel header flanges. Custom designed .100" wall aluminum extrusion muffler body. Standard finish satin. 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. 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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