DR HAS UPDATED THE RAPTOR 250 FAT BOY 4. THENEW DESIGN OFFERS A SERIOUS GAIN IN PERFORMANCE. IF YOU ARE LOOKING FOR THE BEST RAPTOR 250 EXHAUST …THIS IS IT1

The NEW “NATIONAL” Raptor 250 Pipe is in stock

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.
All Fat Boy 4 Exhaust Systems come with a FREE jet kit (for stock carburetor) included with instruction packet

Performance Gain: 5+HP Gain peak; Outstanding throttle response and excellent midrange pull, outstanding top end.

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. 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.
All systems are individually marked with their own serial number.
Complete DRI Technical phone support for installation and carburetor jetting questions.

Recommended Required Modifications: Pro Flow Air Cleaner with Custom UNI Air Filter, Carburetor Re-Jetting.
Larger C/S sprocket advisable in hard pack terrain or on with 18" tires.

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.

Optional Accessories
Custom Color Mufflers and End Caps Available call for details
Turndown $59.95
Fat Boy 4 Replacement Packing $29.95
Fat Boy 4 Rebuild Kit A $64.95
*includes: packing, screws, o-rings, thread lock, decal, instructions
Fat boy 4 Rebuild Kit B $39.95
*includes: packing, screws, o-rings, thread lock, decal, instructions

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.