I had the same problem when I switched the rears from RT660s to NT555G2s (both 305/30/19 on an 11" wide wheel). Car felt sketchy and floaty at high speeds. I also had TC flashing on high speed curves like the freeway transition. I returned them and got PS4S and problem solved.
I see your location is Phoenix. You didn't go to the the Network Alignment on 67th and Bethany Home road did you? I took my Supra there after I did coilovers and I swear the car is still a little off. Only really noticeable when accelerating hard though. Eventually I'll bite the bullet and take...
Thanks! I guess when I clicked translate the page to English the buy option was gone. Did you ever get any definitive temp numbers? I was partially motivated to check out this intake because of your build thread.
Vader Solutions has a pretty solid reputation. I'll be dropping my car off to them for a turbo and fuel system install as soon as they get back to me with a price estimate. I did my coilovers myself but I wouldn't hesitate to have Vader do it. Then get it aligned 20 minutes away at Forza Alignment.