i dont believe the car is moddified, only owned it a week and a half now. dont know about boost, i should get a boost gauge, is there one made that mounts where it doesnt look like a ricer? i dont think it is in limp mode but it could be, it has ful power all the way to 4k then right at it it just stops pulling abbruptly, once it gets ast 4k it seems to pull harder but not as hard as it should.