2003 Ford Mustang Exhaust System?

I will probably get a lot beef about this question… But here I go.
I currently have a 2003 V6 Ford Mustang. I'm not extremely familiar with cars. However, lately I've been wanting to add a exhaust system on my Mustang. I have been looking at the LoudMouth exhaust system. The problem is; all exhaust systems on 99-04 Mustangs are for GT's. I don't have a GT… I don't have the money either to buy a GT. This Mustang was given to me by a family member so I have very close ties with it. I'm a college student so pricing is a huge factor. (Another reason why the LoudMouth exhaust system is preferred) my question really consists of two parts;
1. What do I need to do/buy in order for a GT exhaust system to be compatibles
2. I'm a big fan of those Insanely loud cars (some people find it anoyying) and I want my car to be as loud as possible. If LoudMouth is not appropriate what combination can I use to achieve such loudness?

Please leave your car alone. Modifying the exhaust will make your check engine light come on and you can have many other issues. And when that happens, you will be just looking at your car because you do not have any money for repairs.

If it is not broken, don't fix it.

Mmm beef

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