[Isphius]

Yes, Lots of people do that. It lets you run more air before you hit boost cut, And some people have said it improves the throttle response and driveability. You just the take maf from a v8 lexus, Which reads air slower than the stock one. And the bigger injectors are so your motor isnt running lean. I would say take any aftermarket controls off, And hook it back up as stock as you can. This would rule out the after market stuff being faulty or installed wrong, And if its a genuine toyota problem, Someone will def be able to help. Most notably suprra_girl....shell probably answer this sooner or later. On another note, I think you do have a motor with serious potential if it will even make 20 psi.... That is a crapload. More than it should without fuel cut. Is it an aftermarket boost gauge? because the stock one sucks, And if it is aftermarket make sure its installed/calibrated correctly.