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Tuning i20N Engine & ECU Tuning Discussion

Is this stage one? Are these colder plugs than oem? Does KLASEN recommend them?
As I think the gearbox of the i20N seems not very strong to me and does a lousy shifting task to me I wonder how long it will keepbup to a tune. I have to mention that before this car I had already four tuned cars. So I’ really into it but I don’t dare to do it to my i20N because of the gearbox. And I have no idea if I have reason to doubt about it…
 
Is this stage one? Are these colder plugs than oem? Does KLASEN recommend them?
As I think the gearbox of the i20N seems not very strong to me and does a lousy shifting task to me I wonder how long it will keepbup to a tune. I have to mention that before this car I had already four tuned cars. So I’ really into it but I don’t dare to do it to my i20N because of the gearbox. And I have no idea if I have reason to doubt about it…
Have you changed the oil in it yet? The oil also lubricates the LSD and after I saw reports of the oil being dirty after 10,000km I had mine changed at 16,000km and it was filthy. I used Penrite Pro Gear 70W-75 full synthetic and the shift has been really decent.
 
Why do you think the i20N gearbox is weak? I’ve had no problems with mine and the shifts are consistent and precise irrespective of load and my car is heavily tuned with a hybrid turbo etc.