After my problems with my off road y-pipe my mechanic said that my engine needs back pressure. this sort of makes sense

gutted main cat- increase felt
gutted pre cats- feels like a decrease

Did I do more harm then good? should I get a high flow main cat? some of you are running 3 inch exhaust and y-pipes without a problem why am I experiencing this. or will I be ok with an offroad y-pipe? should I get one with a cat when I send this back?

thanks for the input.

98 silver frost SVT
custom built intake, offroad y-pipe,mystery mod,remote optimizer,short shifter,zex nitrous, lots of stereo, 17 konigs

with paradas.(bent) TOTALED do to freak electrical fire?(that started at a wireing harness ford neglected to tell me should have been recalled as they did with the 95se) I miss this car.

NEW PROFFESSION AS A TROLL.

new car. 2000 dodge dakota 4.7l v8. custombuilt intake, custom exhaust, kennebell pcm, and electric fan conversion, 180 stat, 3.55 pegleg, my old stereo system, 17x7 billets and 255-50 nitto 450 tires. next drop and traction adders. g-tech 14.5

in search of 95 se fivespeed to hang contourparts on.