performance exhaust Jeep grand Cherokee?

I have a 2002 grand jeep Cherokee and im looking to get a performance exhaust. I am looking for a system that has a very throaty growl sound. I was looking at Borla because i heard that there sound from exhausts are really great.

If im doing exhaust i should do Cat-Back right?
Would replacing the headers be worth the money in relation with sound, and performance?

Any advice would be great!!
 
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