[ThomasSr20]

I am planning to get a 3inch testpipe for my car.

I want to know if it make any different on horsepower with the gutted stock cat and a 3inch testpipe.

Thank you

 

[97SE-R C2]

A gutted Stock cat would be worse then a Stock non gutted cat. Its F's up the airflow. Just get a Tesp pipe made.

 

[ThomasSr20]

A gutted Stock cat would be worse then a Stock non gutted cat. Its F's up the airflow. Just get a Tesp pipe made.

Damn i never know a gutted cat is worse than a stock non gutted cat.

 

[sr20ser1997]

I've got a 3" testpipe made by vrs with rear o2 bung for sale.. $40shipped and its yours.

 

[97SE-R C2]

Alot of people when gutting the cat weld a piece of pipe through the center of it to keep the flow. Basically the shell just stays for the visual inspection.