FAT BOY 4 Complete Exhaust System
#FB4-EP8525     $699.00 
All Fat Boy 4 Exhaust Systems come with a FREE jet kit (for stock carburetor) included with instruction packet.

Product Details:

• Guaranteed to be the best quality system on the market
• Race proven like no other
• Horsepower and torque gains up to 25%
• Front/Rear end caps CNC machined from Billet aluminum
• Muffler mounts CNC machined from Billet aluminum
• Stainless Steel CNC machined header flange
• Stainless Steel muffler cores
• O-Ring seal at tail pipe to muffler
• Custom design .100” wall aluminum extrusion muffler body
• All mufflers completely Rebuildable and Repackable
• CNC bent 304 Stainless Steel header, midpipe and tail sections
• All Fat Boy 4 Exhaust Systems come with FREE Jet Kit and instruction Packet
• All Fat Boy 4 Exhaust Systems are individually numbered
• HQ Quiet & Spark arrested mufflers available
• Made in the U.S.A
• OPTIONAL: Custom Colors
• Custom Colors: Available In Black, Red Or Blue Anodized finish
• Bolt-On turndown and spark arrestor muffler bodies, rear end caps, or turndowns are available colored individually or as a complete package  * Additional charges will apply
• By Special Order Only

Horsepower Gains:
On most machines 450 cc and up installing Fat Boy 4, rejetting carb (DRI includes free jets) and installing Pro Flow A/C Kit will result in 7HP gain.

Noise Levels:
Fat Boy 4 is offered in two basic configurations STD and HQ (HQ have a 20% larger muffler).

• On most models using STD Fat Boy 4’s db test at 100db’s.
• On most models using HQ Fat Boy 4’s db test at 98db’s.
• DRI also offer a QP2 tip and spark arrestor that bolt on to any Fat Boy 4. They lower db levels, on average, a minimum of 2db on either STD or HQ mufflers.

Limited Lifetime Warranty:
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.
See Warranty Card for more details

DR Chrome Front Bumper           
#DR-525P         $169.00
(Text Black Bumper available by special order only)
DR Chrome Front Bumpers are hand fabricated to be the nicest steel bumper on the market today.
Each bumper is made from mild steel, heli-arc welded and finished with polished triple plated chrome.
Each bumper supplied with all necessary hardware.
All bumpers are prefit before plating.

Pro Flow Air Filter Kits 
#PD-256     $199.95
Kit Includes: Flange, K&N, Outerwear
#PD-258     $179.95
Kit Includes: Flange, Uni-Foam Filter and wrap

Replacement Parts:
# PD-256A K&N Filter   $69.95
# PD-256C Outerwear  $19.95
# PD-258A Uni-Foam Filter $39.95

Pro Flow air cleaner kits by Pro Design, upgrade the air filter system by supplying a bolt in air cleaner flange, sealed via O-Ring that allows the air filter to be clamped on. This makes the lid an option not a necessary item.

Kit supplied with; CNC Billet Air Cleaner Flange, O-Ring, (K&N or Uni-Foam) Air Filter, Outerwear or Foam Wrap (where applicable)

This kit uses a special air filter made special to work with the custom Pro Flow CNC flange.
**These custom air filters will not work in stock airbox.

GPR Steering Dampener
#GPR-5250    $425.00