OK, so put a new cat in, and we now have boost again. But during the first 8 miles warming up the cat, I noticed that when you floored the gas and then backed off to around half throttle, that that it seemed to stop injecting fuel at all. Like, the engine seemed to cut out . Not a hard cut as if it was ignition, it felt more like very weak mixture or no fuel at all. And then came back when you take your foot off the gas completely and step on it again. No fault codes, and now I know for sure that there is nothing wrong with fuel pressure, boost control etc. I have the feeling that it's something programmed into the ecu, Can anyone enlighten me? Anyone else had this?