If it was the other way around then yea it would cause issues. Its a means to limit compressor surge, like a homemade megaphone(you know those cone mics ) when you yell in it it gets louder.. If you bottle neck the beginning of the piping you get better control of you boost. and when it comes to PSI and motors at one point your motor just cant injest anymore air than it already is, so size with boost is less noticable than say a intake pipe for a N/A car(as bigger is better for them).. This is just a general statment as to what I have come to see and learn on most boosted apps..