Fairly new to all this but anyway......just installed a intercooler kit over the past day or two...took it for a test run, fine at first then accelerated and the boost spiked from 7 to 15psi and then stuttered bad. I read the post in the forum about stuttering but wondered why the car would boost like crazy from just putting a larger cooler on it. There is one tube however I haven't fixed, it used to go into the large pipe that went back into the throttle body, what is this for as I put a bolt in it for now?!?!?! Only thing I could think of....does this tell the computer about boost pressure or something? Do I need to buy a boost controller?