don't get me wrong, grimmspeed is great -- it's just that you're not pushing enough air through the car to take full advantage of that TB or the headers.
That being said, sell the high flow cat (they go for a pretty penny), and use the money to source a DP. As for the midpipe that you have, I have a professional welder and good friend here who can do that for you on the cheap.
Since I'm on exit 210 on I-75 (a slight drive), I'll make it worth it for ya by doing your headlights on the cheap, too