My perception is that parity among 1.6s would have been upset. Would turn into a bit of wallet racing among the 1.6 crowd IMO. Those with $ would upgrade and gain whatever potential benefit was involved. That change alone is still unlikely to get the 1.6 up to par with the 99.
So you are willing to accept zero unless you think it totally meets your expectation of putting a 1.6 on par with a 99. Interesting philosophy. There is a bunch of optional expenses with varying degree of impact that drivers elect to use or not.
Isn't the SM class wallet racing anyway in some sense? How often do you test and put on fresh tires compared to others. More, less......
I didn't think there was any wallet racers left in the 1.6 anyhow from what I read. They all bought and moved on to 99s+.