i would like to test my backpressure to see if my cat is clogged at all, but i dont know how to go about it, i searched a bit and not much came up. what do i use to test it? i know it goes in the o2 sensor bung , but where can i get a backpressure tester? i went to advance auto parts and they didnt have one there. also what is the right amount of backpressure. i read under 6 psi... any help appreciated.

 

https://www.rx7club.com/showthread.p...t=backpressure

 

thanks fdjunkie, i appreciate it i was looking for a few hours and didnt find much , i must be typing the wrong words in the search.