I'm kinda new to this whole turbo car thing so I could use some help. I just installed a CXracing CAI or so they call it on my 2012 Cruze turbo and I have a boost gauge on it. Before the CAI in this current weather it was reading around 10-12 psi. After the install it now reads around 7psi. What would cause this? And if I got a tune would that bump the pressure back up?