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Welcome, you don't state the mileage of the car?
On the ride..
There are several options..
You can increase the profle of the tyres and go for 40 front and 35 rear in stock widths with no issue..
You can go with slightly wider profiles 235 front 265 rear
Different tyres ride differently, the new Continental Sports Contact 7s suit the E89 much better than the Michelin MP4(S)
Suspension wise the springs and adaptive dampers tend to wear prematurely on a heavy and powerful version of the E89. One option is to buy new M Sport springs from say Supplex and ally those with Bilsteain B8 dampers..I used this very successfully on my first E89. A more expensive option is to go for the Ohlins Road and Track replacements, which offer a comfortable ride with excellent handling and are easily adjustable to your tastes whilst preserving standard ride height.
Noise wise the 35is has a noiser exhaust than the 35i..
Idle wise as was suggested plugs, coils but probably your inlets are badly coked up, a very common problem on N54s with direct injection..needs a chemical clean or walnut blast!
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