I never studied physics but very much doubt the difference in rotating mass between two different steering wheels as might be fitted to a Porsche either as original equipment or as a recognised after market add-on would take more or less effort to operate the steering unless there was a difference in diameter ..?
As for "feel" well I have done some of that.. and I do not doubt for a second that my snug fitting furry steering wheel cover slipped over a genuine Porsche 911 RS wheel, would be entirely in keeping with my dangling dice, but would the handling of the Porsche feel different...hmm..? (-:
Customisation is an interesting pastime, it appeals to many folk in many different ways, keeps a large part of the economy turning over and requires a high degree in man maths to adopt some of the more ...err...adventurous must-have components that have evolved over time BUT I suspect it can be a relatively simple matter to over-do it and spend plenty of cash in the process, and in many cases I suspect the eventual outcome would confound any well considered application of cost benefit analysis...? (-:
Over-do.... is I suspect when you introduce some form of imbalance to a well tuned orchestra of parts, and Porsche certainly knew how to play my kind of music during my time of ownership. I spent much of my youth creating imbalance in many m/cycles fitting overly high lift cams, overly high compression pistons, exhaust systems with next to zero silencing/back pressure and then moved on to do something similar to unsuspecting motorcars... Yup spent a lot of time money and effort creating imbalance in what started out as reasonably well designed machinery of the time and enjoyed passing time discussing the next better than ORIGINAL improvement, which was just bound to work out well.. Perhaps more in my mind than in reality..(-:
Never drove a 964, though did spend a day driving a 993 at it`s launch, a time when I owned a non-sport 911 SC and boy was I impressed with the considerably improved power and road holding, it was a revelation indeed, and as such FELT very different to that which I had become used to after many years of Porsche ownership. I did not like that I could see nothing of the 993`s exterior while looking forward and only in recent months did I read that Mr Porsche thought likewise when he first sat in the 993.. It was a long time ago, and while the steering of the 993 was in no way dead, it did not FEEL quite as alive as that of my then circa 10 year old 80k ish mile non-sport SC, all be it shod with supposedly suspect rubber, but the then new 993 seemed to be a natural evolution perhaps matching trends and expectations of modern motoring, a process which no doubt carried on through all subsequent model changes, all be it the designers no doubt constrained to some degree by a marketing dept requiring the engine to be a flat six and situated in what some engineers might determine as the wrong place relative to the gearbox, but then I guess Porsche learned much after the creation of 928 ass a "911" replacement.. A wonderful machine but just too different perhaps..?
Just rambling on in type..