Sway bar issues
 

Ok so I picked up a set of previoualy owned but never installed Meagan Racing sways for my Q40 for $250. They are 2way adjustable 33mm front and 2 way 25.4mm rear. I installed them about 5k ago and have to say I was really impressed with the dramatic improvement in handling! My issue is recently the car has developed a weird sorta wobble mostly at highway speeds when changing lanes especially while going over slightly uneven pavement. The car also seems to pull slightly to the left even though the alignment is with in spec. Any ideas what could be causing this?

Double check and make sure everything is still torqued to spec. Link to the FSM:
https://www.nicoclub.com/FSM/G37/Coupe/

Mine does that also, thought that’s how it was just going to be lol. Hopefully someone can answer, but I’m also on swift springs.

The pull is sepaate from the sway. Try swapping the front tires to see if it pulls to the right. If so, it's a tire issue.

As for the "wobble", your inner ear may just need time to learn the new dynamics.

It's definitely not an inner ear issue lol. i can increase or lessen the "wobble" by adjusting the sways and I've rotated the tires it did this before and after. The steering almost feels loose on the highway like I'm fighting with it and it's worse the faster I drive.

Did you tighten while car was under load?

No it was on jack stands

You've preloaded the sway bars. You need to loosen the bolts, then tighten them again when weight is on the wheels.

Im still using my stock endlinks which aren't adjustable.

Give a try, anyway. It costs you nothing but a little time.

Oh yeah most definitely will I will let you know how it goes.