hey, what's the spec of an X pipe that iwll fit on a 1994. I was gonna cut off the 3rd cat and bring it to an exhaust shop and get an X pipe welded up. Do those front catylitic converters clog before the 3rd one does?? I'm worried I might have clogged cats, I only pull like 24 MPG on the freeway (75 MPH). Recent fuel filter, MSD ignition, recent spark pluges, o2 sensor jsut changed, new air filter, no resonaters.