I have a stock 09 GT and i want to change the mufflers on it, i had a 03 gt b4 and i put glasspacks on it and it sounded fckin awesome, i know if you really want it sounding good you need headers and a good mid pipe but for now what is the BEST sounding exhaust, please excuse all flowmaster series.. i like deep and loud sounding cars. please help

 

So you just want a really loud axle back only right? Then you most likely want the SLP loudmouth setup.

Here is a video to show how loud they are even with stock mid pipes and headers.
http://www.youtube.com/watch?v=y-2EI...eature=related
http://www.youtube.com/watch?v=7zdkc...eature=related

 

Then it seems only glasspacks work best for you. Try the Hooker Maxflow. Think of it as a rectangular glasspack.