Help beefing up exhaust

Hello everybody. I have an '01 GT convertible. When I first bought the car I had some magnaflow catbacks installed, everything else stock. It is still pretty quiet...it has a pretty nice sound between 2k and 2.5k RPM, but at idle it is not much different than stock. When I go cruising around I pull up to these other stangs or camaro's or transams, and it's almost embarrassing because they have that deep killer american muscle rumble (I live in the Detroit area too, so it seems everybody has their exhaust sounding amazing). I don't know much about cars, what gives it that awesome rumble and sound?

I have read other places that an X pipe or H pipe will beef up the sound. What do I need to make my car sound mean like these other cars? What do you guys recommend?

Oh, also does your transmission (auto or manual) effect your exhaust tone? I have an automatic.

Thanks so much for your input!

- Joey

Hey guys, thanks for your feedback! After looking up other people's vids I couldn't resist making one myself hehe. As it turns out, my exhaust actually sounds better than I thought it did...guess it is all where you are listening from. I set up my video camera a few feet behind the stang and fired it up! Here is a link, let me know what you guys think. This is all stock, just magnaflow catbacks.

http://myspacetv.com/index.cfm?fuseaction=vids.individual&videoid=15638752


- Joey