Originally Posted by Mr Wrex
Ok cool. So for each setup, what spring did you use, what psi did you run, and did you notice fluttering? If so, what rpm range did it flutter at?
I used whatever came with the AMS kit for the '07 STI and whatever my friend had gotten with the used setup for the WRX (I think
it was a yellow spring...). It had some flutter and it was based on approaching the target boost.