Question

I just joined the bored yesterday but I've been here off and on just lurking.. My question is this.. I have a 96 Mustang GT AOD. When I went to hanve my 40 series Flowmasters installed I saw that it had 6 cats on the exhaust. If I have all of these removed what can I expect? Thanx for all responses....

Thanx Bone... So I shouldn't keep the h pipe that came stock? I had the cats removed 2 days ago actually lol... I love the sound it really woke the 40's up.. I have lots of questions about modding.. So far I've only done the KN, the flows and the removal of the cats.. I'm thinking I should do the headers next. Any suggestions? After the exhaust I am gonna switch gears.. I was wondering if 3.73's are good for an automatic.. I appreciate all suggestions..