I read that 997TT has a little front lift at high speed.
Is there any aftermarket lip spoiler to make more front downforce to eliminate the lift?
Or the front lift is good to make the car understeer at high speed.

 

Where did you hear that??

 

I read it in a magazine when they review all technological aerodynamic of 997TT, the coefficient downforce for the front is -0.01 (lift) , rear is 0.03 (down) with the wing extended, they said to create a little understeer to make the car safer at high speed. GT2 and GT3 has a lot positive downforce both front and rear. If I remember correctly the rear downforce of 997TT is around 100 lbs & front downforce is -30lbs (lift). at 100mph, while GT3 rear downforce is over 300lbs& front downforce is 200lbs. at the same speed.
If possible by changing the lip spoiler, I just want to make a little positive downforce at front 997TT, maybe 30-40lbs.
I read in GT porsche magazine that Cargraphic lip for 997TT has more downforce than stock, but is it eliminate the nose lift and change to positive downforce.