just random thoughts, could be some play from ball joints, tie rods, shock top mount bearings...the only time I really had this before was when my shocks were completely blown on my civic...mine are pretty much new ~10k miles currently...dunno...hopefully dealer points us all in the right direction!
Earlier STIs had a TSB for shock mount bearings wearing out and making popping sounds. Might want to look into it depending on the build date of your car. I've also seen loose motor mounts make weird sounds as well, one of mine were loose and it was making a weird sound at slow speeds.
yes, I agree it could be the ball joints, tie rods or even shocks, but that all looks in great condition and has been tested.
Top mounts and engine mounts have already been replaced so it's not that.
Dealer still has a car as there is also another issue (although I think unrelated) that I only have when backing up (in reverse) and turning the car almost full lock. Makes a loud thump that you can feel under the floorboard. Dealer replaced the axle, and it did not fix it. The dealer is now replacing Center Diff.
They told me they are waiting to install the black rubber steering lines for the main issue we are talking here at the same time as the center diff.
I've owned this Sti for about 6 weeks and I think I've narrowed down an annoying sound. I think my back dash brake light is vibrating against my back windshield on idle. Has anyone else dealt with this? How did you fix it?