Duncan Racing

FB4-EY3700

Fat Boy 4 Full Exhaust Pipe Muffler Raptor 700 09 10 11

SKU: 380392335840

Complete Systems

Surface Finish: Silver
Warranty: Yes

Fat Boy 4 Complete Exhaust '06-'09 Yamaha Raptor 700. All Fat Boy 4 Exhaust Systems come with a FREE jet kit (for stock carburetor) included with instruction packet. No HQ muffler available. Fuel Injection Modifications: An EFI Vortex Interceptor is strongly recommended to ensure proper air-fuel mixture. Proper air-fuel mixture will help a machine to make maximum power and reliability. VORTEX EFI INTERCEPTOR: The Vortex EFI Interceptor unit is a highly sophisticated unit that offers a simple solution for attaining the proper air-fuel mixture for your modified FI Raptor. This affordable, plug in module taps into the fuel injection drive circuit from the standard ECU whilst monitoring the Throttle Position Sensor (TPS). Other Required modifications: Pro Flow Kit with K&N Air Filter, Air-fuel mixture adjustment and Vortex Interceptor EFI.Pro Flow kits. Larger C/S sprocket advisable in hard pack terrain or on with 18" tires. Performance: 20% HP Gain peak; 20 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.

EBC Brakes UPR7159K Ultimax OE Style Disc Kit Front 12.3 in. Dia. Pair
Cams 1400N 1 Replacement Adjusting Magnum 1400N-1
Mix me 2909