Thanks for the welcoming replies, I definitely feel I'm gonna love this forum is all about performance which I love most.
After I will get Lyndon's Tune, I have some other Opel GT owners around here with european tunes which I will try to convince them for a drag race and post the results. Also very curious to see dyno tests.
It is my first RWD car and I'm in process to learn it, I previously owned an Opel Astra Coupe 2.0 Turbo upgraded a little bit.
The worst part is there are no good tuning specialists in this country, but I have a lot of friends in my car club with performance cars and we are learning from each other, they all have top models of Mitsu, Subaru, Audi, BMW and some Opels in different stages of tuning.