Bully dog’s rule of thumb for exhaust sizes, Introduction – Bully Dog 81201 Rapid Flow User Manual
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rAPid FlOW inSTAllATiOn
rapid Flow exhaust # 81010,81201
INTRODUCTION
The Bully Dog Rapid Flow Exhaust Systems have been specially designed to allow the lowest mandrel
bends in the industry. The lower mandrel bends allow increased air flow which reduces exhaust tem-
peratures, burns more fuel in the combustion chamber adding additional horsepower and fuel economy.
This instruction set covers the 4” Rapid Flow Exhaust Aluminized Exhaust as well as the 4” Rapid Flow
Ceramic Coated Exhaust designed specifically for the 7.3L Power Stroke. Both systems install exactly the
same way.
Note: This instruction set and the Rapid Flow Exhaust system included are made for the Ford 7.3L Power
Stroke ‘99-’03
BULLy DOg’S RULE OF ThUmB FOR ExhAUST SIzES
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