Flowmaster

I am thinking of buying the flowmaster cat back system and i am not sure if i should get the American Thunder or the Force II.. Any body got eather the American Thunder or the Force II on there car? Let me know what you think..
 
The force II and American Thunder cat backs are ok IMO, but I like the ORIGINAL 40's not the delta 40's. If you want the old school badass muscle car you can buy the orginal 40 muffs and have a exhaust shop make a cat back for you, thats what I'm getting done, because I hate my super turbo dyno craps :notnice: