This was the NA+turbos on racefuel at 15psi:
 Here is the A/F and boost plot:
 Here is a stock turbo'd Z32 (native TT: racefuel is the higher plot):
 HEre is the same TT's A/F and boost pressure plot:
 To ring your noddle a little more, the turbo'd NA also had automatic turbos, which have a smaller turbine housing of which will improve spoolup response. That turbo'd NA had most of the bolt-on mods and is very comparable to the plots of the native TT above. You can clearly see the difference in the boost plots of the two cars: a result of the NA's higher compression. Joel Grannas's Sport-600 TT: (note the HP and torque at 4000RPM - WOW! :)
 My personal Z: I am making 1bar of boost by 3100RPM - note power and torque at 4000RPM.
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Here's some dynocharts to show some stuff >>> - 
