So im not ready to do this yet but i want to get as much info as i can before so. I will be replacing the cat-back dual exhaust on my gtp. I want to know if a true dual exhaust will better my performance or worsen it, i have heard both ways. Also what about straight pipes will that better or worse it? Ideas and opinions needed to thanks. If you need to know i will be going with flomaster.

The stock catback isnt restrictive till around 350whp, iv found that the only decent sounding exhaust systems for the 3.8 are the borla, and corsa, a catback is a waste, if you want to change the sound just change the muffs... also dont straight pipe it

Ok thanks for the answers, i would like it louder and deeper, not ricy, more muscley.

Ok thanks for the answers, i would like it louder and deeper, not ricy, more muscley.

Its hard with the 3900 because stock they are very raspy, but people have had good success with corsa or borla mufflers