I did this once on an early 80's Dodge V-8. Acceleration from a stand-still suffered.
Pulling the CAT alters back-pressure and that in turns affects things farther upstream. My 2 cents.
1991 300-SEL - Model 126
M103 - SOHC
James Madison - Oppressors can tyrannize only when they achieve a standing army, an enslaved press, and a disarmed populace.
Liberty Firearms Training - After years of trying to regulate California criminals with a never ending stream of gun control laws they have still not given up with the belief that if they make something a crime that criminals will miraculously start obeying the law.