rabbit Ive owned a r33 gtst, running the basic mods fmic, splities, zuarst , boost, etc ec
i was running a blitz unit and 1 bar, there were 0 flat spots in the rev range. the car was actually on the dyno were it made 212rwkw on 14psi. so obviosuly you would be able to tell if there were flat spots being on a dyno
Also a 2nd car
my mates with the exact same mods made 217rwkw and also had no flat spots.
rb25det turbos are great standerd items being ball bearing and are able to run the 1 bar.
now for boost controllers, ive ran every boost controller there is out, greddy profect b2, greedy e-01s, alot of blitz units, avcr, e boost etc etc
out of all the boost controllers ive used id never go pass the new blitz dsbc, the rectangle shape ones. there very easy to use, and have a great solineod. avcrs are only a single so can only run 2 stages of boost. alot of tunners dont like the avcrs as they tend to take alot more time to tune.
Bang for buck tho the greddy profect b now around 350 from memory, ive owned plenty of these. good cheap units.