Bully dog’s rule of thumb for exhaust sizes, Introduction – Bully Dog 81204 Rapid Flow User Manual
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rAPid FlOW inSTAllATiOn
rapid Flow exhaust # 81510,81204
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 and burns more fuel in the combustion chamber. This results in additional horsepower and
fuel economy. This instruction set covers both the 4” Rapid Flow Aluminized Exhaust and Ceramic Coated
Exhaust designed specifically for the 7.3L Power Stroke Excursion.
BULLy DOg’S RULE OF ThUmB FOR ExhAUST SIzES
Note: This instruction set and the Rapid Flow Exhaust systems included are made for the ‘01-’02 Ford Excur-
sion with the 7.3L Power Stroke .
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