Hey Guys, new to the site. Recommended by a friend. I just bought my 09 Cooper S 6 weeks ago from a dealer with only 37000 miles on it. Ran like a dream up until the about a week after owning it. All of the sudden it would sometimes hitch up and make this nasty rattling sound when I put the hammer down and the turbo would kick in. It's random and doesn't do it all the time but I've gotten pretty good at duplicating it. So I find out it has a recall on the timing chain, tensioners, guide's, pulleys etc. I figure that's gotta be the problem. Dealership replaces all the parts and it still has the same problem. They had my car for a week and said they can't get it to do it. I've had a master mechanic look at it and drive it and he is confused as to what it could be. My friend who put me to this site said maybe waste gate sticking? Anyone else with this issue? Thanks so much