Thermal, Apexi or Greddy Cat-Back?

[Budget Tuner]

Thermal, Apexi or Greddy Cat-Back?
I want the deepest lowest sound you can get, and I am currently leaning towards the Thermal.
Keep in mind I will have a Star Stage 2 with a test pipe most likely.

 

[Malenko]

my thermal had an AWESOME DEEP tone to it before turboing, its still low but not nearly as loud as before. I have a Star Stage II with the stock cat (for now)