For visibility reasons I removed the stock GSR wing on my Evo X.
on turn 8 at big willow at over 120mph the rear end of my car tended to get noticeably loose. Would keeping the wing on make the car feel significantly better planted?. I guess maybe the question is whether the stock wing really does contribute an appreciable amount of downforce at those speeds and is worth keeping on. I really don't want to deal with putting in on and taking it off repeatedly if its contribution is negligible.
The car is currently set up with the Muellerized Stage 1+ which consists of Swift R springs and Eibach sway bars and alignment. Stock Yoko A13Cs were used on the runs at a warmed up 40psi. I don't have alignment numbers on me right now.