I'm not sure exactly what that would mean. I know some cars have a target power output. When that's reached boost gets throttled a bit to keep everything within the manufacturers desired specs.
We have similar limiting factors
With 60mm throttle body, SRI and FMIC I was at 188 whp and under hard throttle it would feel as though it was being held back. Even the logs showed the timing being cut back along with boost dropping to 12 lb. Then I did the DP and full 3" exhaust I hit 209 whp consistently on a stock ecu and I can still tell when the ecu pulls timing and boost. This is a big difference when compared to the stock 166 whp with the A/T.
So my answer would be both yes and no, if you don't have the supporting mods on both sides intake and exhaust the ecu will learn to limit output. High cylinder temps from exhaust gases not flowing freely or being restricted will cause detonation which in turn causes the ecu to pull timing. Some of the other limitations you will actually feel is from the stock DP, if the exhaust passes through the turbo and then gets stopped with restrictions wouldn't you think it will affect the output from the turbo and why we see boost drop at higher rpms. 95% of the stock exhaust actually not that restrictive, the DP with the cat 3" from the turbo, ehh actually not the worst but below that where the mid pipe bolts up is a flange with the inside diameter of a Prius exhaust pipe. Exhaust is only as good as its smallest point and that cast flange is 1.637" inside right at the base of the DP = not good. Even just doing the DP from Tork or 845 is ok but until that flange is gone from the mid-pipe the restriction is still there. Near the rear axle is another flange that is not as bad but takes the nice mandrel bent factory 2.35" piping and reduces it to 2". Like honhon said ^^ but in different words 'if you let it in it will need to come out' and that works the other way around also.
