I'm curious about the power gains if i were to switch from a high flow cat to a test pipe.I have already been custom flashed with a full exhaust,boost controller, and 272's. My friend with a ford diesel had it done so I am curious of how much it would help. Would switching it on and off do anything to the flash to make the car run bad?

 

i asked Al the same question during my custom tune with a hi-flo Works cat on.
he said around 10whp switching to a test pipe on the same tune without any issues.

 

thanks a lot man

 

thanks