See the 3600hp page that I posted on for some. Also, diesel, hybrid, electric, propane, E85, nitromethane, up to 8 rotor rotaries, jet engines, natural gas, water, biodiesel, carbon fiber re-inforced plastic, automatics, independent suspension, switch pitch differinsials, motorcycles, 1, 2, or 4 injectors per cylinder, and electric carbs.
you do understand that most of it is already spoken about a million times?
So! Can you list what hasn’t?
Also, I’m kind of new to the game.
… 
This should be fun… [size=50](let me see if I can get my answers in before the thread gets locked!)[/size]
Diesel = maybe, most likely DLC
Hybrid = maybe, most likely DLC
Electric = maybe, most likely DLC
Propane = no
E85 = maybe (in terms of octane, it’s very similar to 95 AKI – so calculation-wise, no real changes – just added UI “clutter”)
nitromethane = no
8 rotor rotaries = probably not…
jet engines = no
natural gas = CNG? no
water = really?
biodiesel = see diesel
carbon fiber = in the car designer
automatics = yes, eventually
independent suspension = yes
switch pitch differinsials [sic] = umm… there’ll be more types of differentials, yes
motorcycles = no
multiple injectors per cylinder = no
electric carbs = no
I think that about covers it… 
Locked, as the questions have been answered (Not to mention multiple times already, in different threads), plus some of the answers were downright outlandish.