I just bought my mazdaspeed 3 about 4 weeks ago. I currently have about 1300 miles on it. Around 400 miles I noticed that the car starting losing overall power. I thought it may have just been the gas, but after quite a few tanks later it still doesn't run as good. I took my car back to the dealer and they told me that it is running fine. However, I disagree. When I first bought the car I could get on it in 2nd gear and spin the tires. It won't do that anymore. Sadly, I feel like my car now runs like a GTI. I am thinking that one of the clamps on the turbo inlet is loose or something. Another problem that I noticed is that the car doesn't shift as smoothly as it did the first couple weeks I had it. Does anyone have any ideas? Any feedback would be greatly appreciated.