Okay, so I've had my car for almost 2 years now, and have been really happy with it. Took it for a dyno couple of months ago and was making 135kW at the wheels which I thought was pretty standard. No engine mods except for the Carbonio intake. However, over the last while, I've been wondering if my car might have a boost leak or something making me lose power. My first cause for concern is that boost only seems to come in at about 3,000rpm I scan the car regularly with VCDS and no errors at all. Other than the delay in boost, there are no indications that anything is wrong. No erratic idle. No surging, just normal (if sluggish) smooth driving. No oil around the PVC. What has finally gotten me to suspect if something is wrong, is that I bought my wife a used A3 with the same engine, and her boost is kicking in from about 2,000rpm (which is what I think is normal) and her car pulls like a train. Feels at least 20kw stronger than my A4. I asked the previous owner if he did any software on the car, and he said he hadn't, but he was also not the first owner. How do I check if my car has something making me lose power?