My car is an 04 with 78k miles (had it for a month)

The day I got it I noticed a slight vibration under acceleration (4-5-6 gears more noticeable), upon searching the forums it seems that the problem has to do with the CV joints.

I got tein flex coilovers installed and the vibrations got worst.

From my understanding the CV cups wear out with grooves and whatnot, would halfshaft spacers fix this entirely or do I need to do a swap? I had vibrations both lowered or not.

I checked it out with my mechanic he says its the differential and says CVs cannot cause vibration (he's not familiar with s2ks).

Now I'm not sure what to do!

Any clarification with personal experience would be greatly appreciated.

 

You see this in the FAQ https://www.s2ki.com/forums/index.php?showtopic=693173

 

I read the FAQ it doesn't explain lowered vs nonlowered vibration (whether or not spacers would eliminate the problem if I had vibrations in both circumstances) and possibility of differential failure.