So the car runs rich everywhere over the power band, at every single load level, at any rpm?
You did all the math to calculate how much more air is being let it everywhere over the power band, at every single load level, at any rpm??
You calculated how all that air would react with the “rich” stock tune everywhere over the entire power band, at every single load level, at any rpm??
You calculated how the decreased back pressure would affect the above?
You calculated how the millions of things I left out come into play?
Did you do any logging whatsoever?
You can tune the with your mind bro?
I didn’t think so. A cat back is one thing, but an intake and downpipe as well is a ticking time bomb. Get a tune ASAP or take all the parts off until you can afford a tune.
500 dollar tune or 9000 dollar engine. Your choice.