ok, ive done a search, and didnt find quite what i was looking for, now Im looking to start off mods on my car (MY02 WRX)

Im looking at doing the exhaust, and either ecutek or verso.

Now heres my questions, what are some of the pros/cons of a China Spec exhaust verus say, a MRT Exhaust.

Also, what are the pros/cons of ecutek vs Verso (if theres any difference)
I dont need to know about how much cheaper something is, Im more interested in performance and mechanically and quality.

Thanks for any help you can provide me.