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I’ve been using P&S Brake Buster, lately (diluted at 1:1). It certainly cleans well, but I’m more appreciative of its anti-corrosive properties which noticeably reduces the amount of rust that forms on the rotors after cleaning. When using other wheel cleaners, I’d have to quickly dry them...

It could be the headliner towards the back where it meets the rear window. Mine was loose, it would move up and down if pressed. I wedged some foam/rubber material on either side which helped tighten it up and reduced the noise it made over bumps.

I haven’t noticed the squeak you’ve described, I’ll try listening for it though. Regarding the muffler valves, mine will sometimes rattle at idle during a cold start (at least I believe it’s them). I forget which mode I have it in at the time, however.

BMW has long been panned for unsatisfying manual transmissions. In my experience it’s true. They almost always have rubbery shifters, and often odd gearing, clutch feel, etc. The 4BW’s tremec is very satisfying, offering a solid, accurate shifter and proper gear spacing. Its clutch is smooth...

For me, the larger value gap is between the already well appointed ZL1 and the 5BW. The 5BW is the nicer car, but has similar bones and is $30k more. A nicely optioned 4BW is, what, $20k more than a loaded SS? The engines are different, but each have benefits over the other; one torquier and...

Except for the usual balky 1-2 shift when cold, the 4BW’s shifter operation is satisfyingly smooth and solid. There’s little to no engine/transmission vibration felt through the shifter or clutch pedal. There’s also no annoying clutch chatter or driveline shutter, either (if any, it’s very...

I got the "Service Instrument Cluster" warning last week (one time). IIRC, it came on during a cold start. I cleared it and it hasn't come back. The car has under 500 miles.

I have a similar buzz coming from the dash area when accelerating in Sport or Track mode. I tracked it down to the rubber phone charging pad. It has some movement when I press down on it. I put a folded black MF towel in that area which put some weight on it and the buzz is gone. I also have...