I have the aps fuel extreme system does any one put a guage on it for presure?

For the wideband question? I want to keep my factory o2 sensor for my greddy tt. It it ok to put a hole in the exahst right after the oem cats? or do i have to put a hole in the oem cats

 

theres no fuel pressure gauge on your pressure regulator?

and a wideband o2 sensor NEEDS to go before your cats. when i had my car s/c'ed i drilled and welded bungs right on the top of the oem cats by the flange.

goodluck.

 

uh oh I hope the OP saw the post before its too late