Bully dog’s rule of thumb for exhaust sizes, Introduction – Bully Dog 83420 Rapid Flow User Manual

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rAPid FlOW inSTAllATiOn

rapid Flow exhaust # 83420

INTRODUCTION

The Bully Dog Rapid Flow Exhaust Systems have been specially designed to allow the lowest man-
drel bends in the industry. The lower mandrel bends allow increased air flow which reduces exhaust
temperatures, improves engine efficiency and increases horsepower. This instruction set covers the 4”
Rapid Flow Dual Aluminized Exhaust, an exhaust designed to give that unique look and functionality.

Note: This instruction set and the Rapid Flow Exhaust systems included are made exclusively for the
6.6L GM Duramax vehicles ’06-’07.5 Classic.

BULLy DOg’S RULE OF ThUmB FOR ExhAUST SIzES

IMPORTANT: This Rapid Flow Exhaust will not fit on Extended Cab Short Box trucks. Call Tech
Support for options before you begin install

300 HP

400 HP

500 HP

600 HP

4” Exhaust

Systems for

HP Applications

Less Than

450hp

5” Exhaust

Systems for

HP Applications

Between 450hp

and 550hp

6” Exhaust Systems

for HP Applications

over 550hp

4”

Ceramic-Coated

Exhaust System

for all HP

Applications