A few issues, wondering if anyone else has the same

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1. I normally drive in M mode and I just noticed starting earlier this week that my exhaust in M mode is not as loud as it used to be. It's normally significantly louder than in non-M mode, but now it's only slightly louder. Also, I feel like the power is a tiny bit sluggish.

I checked to make sure the flaps in the exhaust were still opening and closing and I saw they were open with the car in park and closed with the engine off.

I haven't seen anyone else post about a problem like this but thought I would ask.


2. At cold start-up, the exhaust rattles and sounds like there's some loose metal in it.


3. When I park and turn off the car it makes a loud squeak noise. Kinda like what you would hear when you park on a hill and set the parking brake then the car jerks back a little. However, this happens almost every time I turn the car off even though it is parked in a flat garage. Is this normal?


4. I have a very intermittent high pitch whistle type sound. I have tried everything to make it happen but it's completely random. I think it's usually at slower speeds and sometimes even when I am at a stop. I know it's never going to make the sound when I happen to take it in for service, so this is another one of those quirks I have given up on but does anyone else have something similar?

Thanks!