boost controller mite not fix the problem if there is an issue with actuator or waste gate etc etc, i heard of people having trouble with there waste gate after fitting cheap or dual dump down pipes, if not made correctly, they can stop waste gate opening
Ya I would rather just find and fix the problem too.
There was a full exhaust system on the car when I bought it with a de cat down pipe. I bought a cat and removed the de cat down pipe to c if this would help.......it made no difference.
Just at the stage that I cant afford to keep throwin wasted money at it!