How rough was yours ideling? It wouls seem to me that you would definitly fell that you car wasn't running that strong, right? I notcied the same exact thing that everyone else has here I guess, even the first day I drove it off the lot. It is definitly worse with a bov, but thats all worth it You just gotta drive it a little diferent, somtimes if I rev it up a little at a light, the rpms will drop to 100, which kinda scared me at first, but I think its cause of the bov. But you will definitly get use to it.

 

It's not too bad, sometimes it's worse than others. After reading all the posts etc and having a fellow 06 STi driver sit in my car I'm pretty sure it's just a quirk of the car.

 

Try higher Octane gas, Smoothes out the idle alot.

 

91 is all we can easily get at the pumps. We have crap gas here.

 

Does getting a Ecutek or Cobb AP with a 91 octane map help at all?

 

I know the gas is bad here (I'm here to) There are a few union 76's around with 100 Oct at the pump

 

A small fluctuation in RPMs is normal on 91 gas...91 is the highest in my state (CO) and I still get a small flutter. No big deal, it usually pops back up after the car has warmed up. If it continues to be an issue have it looked at.