Ah, if we are doing dyno plots, Stock M5:
Makes a good tow car too, with 360+ lbs/ft torque Chances are it will be towing something to the club track day at Snett if you fancy test driving one? Otherwise pop up sometime if you are thinking of getting one and you can take it for a spin and I can give you some info on what to look for in a good one. If neighbours are a problem then they are only noisy if you do a muffler delete, otherwise it will be much quieter than your Williams at idle I would think.