NO BOOST Problem

Today me and my friend drove the gsx down to a shop in order to get it inspected, and on the way there, the car would hesitate at 3000 rpm, in every gear. Seems like its boost is cut off , the aftermarket boost gauge reads 0 psi but the stock gauge inside the dash read full boost. What could be the problem? We checked all the lines, dont seem to be any sort of leaks anywhere. What could this be??

do you have a boost controller on your GSX?

yeah, check on the boost controller if you have any.