Originally Posted by MORE IMPATIENT
to reduce boost, get a boost controller, if you want to make the turbo have an external wastegate you need to remove the flapper door and the downpipe must cover it and have a good seal or weld the wategate hole shut on the turbo exhaust housing........
you cannot lower boost with an MBC, only raise it. if you want to understand why, look into how they are made. the best way to lower boost is with an external wastegate setup.