Saw your car on SeatCupra when I first bought mine and found a lot of your posts helpful! Sorry to hear about the problems
When I went down to APR a few weeks back the tech showed me my cam follower which had only been changed 5000 miles previous!! Was shocked at how badly worn it was! Then he showed me the intake cam had markings on it... Then when setting off from traffic lights getting cloud of blue smoke, could be the decat but also could be turbo/pistons
Looks like 50,000 miles at Stage 2+ in 18 months has taken its tole on my poor BWA engine
Strip and Sell time :(
Think next couple of years we will hear about a lot more of the BWA engines having problems with the intake cams as even though you put the new follower in it has already done the damage!!