Hmmmm when i had my old glanza i got my self a HKS actuator and set it at 0.8bar then a few weeks later i took the heat shield off the mani and gess what i had a crack not to bad but enuf to lose boost!!! So i got my self a standard mani and put it on and took the car for a spin and i hit fuel cut straight away so yeah if the mani is blowing get it sorted lol dont forget when it get super hot the crack will expand!!