2003 Mustang GT: SOUND

I have a 2003 mustang GT and everything is stock except for the exhaust. (I have a Flowmaster exhaust system) and i was wondering what could i do to my car that would give it a deep, loud, RUMBLE!!! Any suggestions?

cam, headers, larger diameter pipe...

I have a 2003 mustang GT and everything is stock except for the exhaust. (I have a Flowmaster exhaust system) and i was wondering what could i do to my car that would give it a deep, loud, RUMBLE!!! Any suggestions?
http://www.mustangexhaust.com

I have a 2003 mustang GT and everything is stock except for the exhaust. (I have a Flowmaster exhaust system) and i was wondering what could i do to my car that would give it a deep, loud, RUMBLE!!! Any suggestions?
Nothing will make flowmasters sound their best then Long Tubes and a off road h-pipe will.

HIFLOW, how much and which brand do you reccomend, i get for a long tube; also i am from TX, and we have emmision laws so i have to get my car inspected every year,will an off-road H-pipe make my car fail state inspection?

Youre going to have a pretty hard time passing inspection with Long tubes and an off-road midpipe.

Mac makes some cheap long tubes but arent great quality. BBK are pretty good too but I dont like their sound. Either way youre going to have FUN installing them!

Iv'e decided to go with an off-road x-pipe made by bbk, installed and shipped, for about $390, do you think this is a good idea?

I think every Ford V8 car is begging for LT headers. So I would not think this is a good deal cause if you decide to goto LT later you will have to pay for an X-pipe again. So I would just wait till I had the time and money for LT headers and a shorten X or H-pipe.