Installed some Chinese knockoff IC I got off Ebay. Didn't feel like spending the coin on the name brand stuff I have 3 kids so I have to save whenever possible. I will say stock IC definitely are a restriction when trying to turn the boost up. I really can't say what is the exact point but I know previous to the install I could never maintain higher boost levels I would always have abrupt drops or big spikes. Since the install iI can reach and hold 24lbs with a slight taper as rpm rise. Overall fit and finish was spot on. As far as longevity goes too early to tell. They definitely took my car to another level and I feel improvement all throughout the rev range not in just one particular area. Can't say for sure what they added but in my case we'll above the basic advertised numbers. Engine bay definitely got an upgrade as well. I am extremely happy with them so far. Just figured I'd share my experience.