I am going to get a catback system. Right now I have TH Hard Pipes, TH SMIC, Apex 2.5" J pipe w/cat, injen intake, and hopefully a cat back soon. This is all I am going to do besides a Greddy Type-S BOV. Which cat-back should I get? Magnaflow or Thermal R&D? I like the way these 2 sound the...