Nothing additionally appears in tuning screen regardless how many hidden upgrades i've installed to car. The only difference you can notice is higher power, lighter weight, tires name (As on screenshot i've posted) and as a result higher PP. So, that's why i didn't pst more screenshots. The only place where u can change tires is screen before race, where you can change Traction/ASM/ABS etc... So, only there you can choose installed additional tire types.
As i've told before, believe me or not - it's up to you. I won't do special effort to prove myself.
Btw, forgot to answer question about my tire tests. So here is more info (i repeat everything, because it's hard to find in over-flooded topic):
Car: Lancer Evolution Racing Car (no any additional tunings besides tires)
Track: Cape Ring (full length)
Best time: 2.30.2 shown on Racing SuperSoft (C). On Racing SOft tires i could achieve only +0.6sec.
Well, i'm not really good driver, but tried at my best
Found 2 more types of X2010 5G. One type looks exactly the same as original X2010 5G. Couldn't find any difference. Another type of X2010 5G looks exactly as X2010 S.Vettel. Same livery, same parameters, but called X2010 5G. All of them have different IDs. Weird..
Also, it looks like i've missed somehow BMW Z4 '03 from premium to standard list.
There are additional Corvette C7 in GT5 (diffenet ID from original C7). Same livery with cover, but different name. It comes as Gran Turismo tuner and name XXXXXXX. There is some flag i've found. When you enter GT Life screen, you will get message something like "Congratulations, you have been chosen to test a new car 'XXXXXXX'. blah blah blah" And then you get ticket for this car in delivery truck. Car itself is not DLC (unlike original C7). All parameters are the same.
Yesterday i've tried to find evidence of any additional configuration of RouteX. Unfortunately, didn't find anything except that single config we all know.
Sorry if new findings are not so exciting as previous.. There are fewer and fewer chances to find something i've missed before.