I have been running Cobb stg 2 LWG map with Cobb intake and turbo-back for a year, and everything was perfect. Today, I switched my setup to Injen intake, and added upper/lower intercooler pipe, intercooler, and a bov. I loaded a Cobb Stg 2, 93 Octane Injen map, and my car ran like crap. It was bucking every time I get off the throttle, very choppy and not smooth, and I would hit 18psi on AFR when WOT, causing my Failsafe to beat at me angrily.
Later, I switched to the LWG version of the same, and everything went smooth again, but I still hit 18psi when on boost. The shop that installed all the parts for me said something isn't right and suggested me to have my car tune by him to run better, however, I have always have good experience with Cobb OTS map , and I am not sure if the installer did something to screw with my car so I would have to pay more to get it tune by him.

My mods are in the signature, beside the 3-port which hasn't been installed yet.