Turning it off, and turning it back on should take it out of limp mode, and drive it carefully to keep it out of limp mode till you can get the boost sorted.
You are not the only person to have this problem with a 3" exhaust, and it is one of the reasons why I chose the 2.75" Beaudesert Exhaust.
Unfortunately, even after choosing the smaller exhaust I ended up having a similar problem with mine after I added the new exhaust, but only after i had it for a few weeks of general use, and got from Melbourne to Innaminka via a double Simpson Desert crossing.
Nissan solved mine during its next service ( it was due straight after the trip anyway ), but their fix has meant it has never gone as well as it did before, so it took a edge off the performance gain.
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