Originally Posted by zztwinturbozz
I have Cobb stage 1 sport on otherwise stock XI. Very choppy and surges. Every car is different though!
Can you elaborate please? What year is your car? Auto/stick?
What do you mean choppy? The car is bogging, doesn't accelerate smooth?
Do you still have it installed or you removed it?
I was pretty set on ordering this tomorrow until your post.