Allow me to explain better.
Displacement up - Port Polishing - Engine Balance are gone.
Engine tuning basically has been reduced to a somewhat arcadey Level 1-2-3.
Stage/Level 4 modifications are gone, and so intercooler selection
Racing clutches and flywheels are no more.
Only three softness levels for racing tyres.
On the other side, air filter selection (sport and semi racing), sport intake and exhaust manifolds and sport catalyzers have been added.
I'm disappointed that modifications appear to be more generic than before, with less technicalities to appeal to a broader public. Even though after four games the descriptions got old, new users could still learn something from them.
To be honest, I was expecting more detailed engine tuning, not more generic.
I guess I was expecting too much?
Now let's wait for the parts set-up screen...