GT 2.0 JTS Up grade

[Alfa Mexicano]

Hello there, I´m in the process of up grading my GT 2.0 and need some feedback regarding experiences with some items I´m considering for it.
I have started with a magnaflow cat back (as at this side of the ocean it's difficult to find Ragazzon), and now I´m considering the CDA filter and Upsolute re-map. Any ideas or experiences, pls? I´m planning to take my car to a dyno and see the evolution step by step, meanwhile, does anybody have done that and how much was your power gain?
¡Muchas gracias! ( Thanks a lot!)