i have a 06 wrx with Tanabe S0Cs coilovers installed, i dont drive the car hard, but i noticed a loud metal to metal noise when i go over small bumps.
looking back to tanabe site
http://www.tanabe-usa.com/s0c.asp?id=6
there isn't a soc made for 06 wrx im wonder if i installed the wrong coils on the car, but the shop i bought it from says it'll fit... any idea whats wrong?

 

check you spare tire and make sure it tightened down. I had the same issue and found that it was the spare.

 

if it's not the spare could be your top hat bushing....notice that was the case on mines...