Part Number: FB4-EH4500 Fat Boy 4 Complete
Exhaust System Honda TRX 450ER Pipe

New Batch in Production…More Pipes Available Fall 2021

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.

Product Information: Complete Fat Boy 4 Pipe
Includes: Free Jet Kit for Stock Carburetor

***30 DAY 100% SATISFACTION MONEY BACK GUARANTEE***

Model: 2004-05 Honda TRX 450R

Price $699
Performance: 7+ HP Gain when tuned properly and
used with an upgraded air filter kit and Vortex X10 CDI
Great Power Gain! Excellent Throttle Response-Very Strong Midrange Pull-Excellent Top End
*DR also offers alternate configurations for Big Bore/Stroker Motors and
Very Hi Compression Engines. Contact DR for more information

The DOMINANT Pipe in BAJA! Fat Boy 4 Exhausts have won numerous Baja 250, Baja 500, Baja
1000’s plus multiple Score ATV Overall Championships.

FB4’s have also DOMINATED in Best In The Desert. Winning the Famed Vegas to Reno over 10 times
No Exhaust Can match the Reliability and Performance of a FAT BOY 4
Other Required modifications:
-Air Cleaner Upgrade: Pro Flow Air Cleaner with K&N Air Filter or Fuel Customs Intake
-Carburetor Rejetting *FREE Jet Kit included
-Larger C/S sprocket advisable in hard pack terrain or on with 18" tires.

Fat Boy 4 Features MADE in USA
-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 repackable.
-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 tuning questions.

Optional Accessories
Custom Color Mufflers and End Caps Available call for details
Turndown $39.95

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.