Take it to COBB in Austin they will run over the car and make shure every thing is good then tune your car safely.
Tune out all those issues.

I would not worry about it I'm running single out 3inch catback I have seen some over boosting.
Best thing is drive it easy till you get tuned safely smooth boost curve and afr .

 

Last summer, I bought a bunch of stuff from ETS including their intake and I also ordered a Turbosmart dual port BOV. I had the car tuned by Ron Soliman from RS Motors. Ron is famous where I live for his amazing tuning and work on all types of Evos. Anyway, to make sure that he could tune the BOV, I got 3 springs from TS: green, red and yellow. Ron tuned the car the best he could, but one thing is for sure, it cannot hold boost like a Synapse can. My son has a 2011 Evo GSR with the Synapse and his can easlly hold boost to whatever it is set at. The TS can only hold boost to 24 pounds. Worse, no matter which spring was used and no matter how much tuning was done, there is horrible flutter. I love the way the TS sounds, but I am going to sell it with only 300 miles on it and get a Synapse.