Hi guys im new to this forum and new to subarus. I recently bought a 2011 wrx hatchback and it had a boat load of mods done to the car befre i bought it. Now when i say im confused thats just being moddest. I am hearing this sort of wastegate flutter when i floor the gas. now i noticed it starts at 12 psi / 3500 rpm all the way until redline or until i let go of the gas. After careful reading, research, and asking questions i am stuck. My car was tuned by Akuma Motorsports and I took the car to them and there saying its normal because I have an electronic boost controller solenoid from grimmspeed. Now my best friend has been building boxer motors for three years and he is also a subaru mechanic. He is telling me the wastegate should not be fluttering underload and should be a solid screaming sound regardless of boost controller. Grimmspeed said its normal because of the design of the ebcs. Tial had no comment on the situation (email.) I decided to buy a new Boost Controller ( manual ) from turbosmart as well as a new Grimmspeed Wastegate bracket ( mine was slightly bent.) My friend said switching over from ebcs to mbc could cure the problem. as well as my bracket not being secured properly could also be at fault. I am getting so many mixed answers and it is extremely frustrating and costing me money. what could the problem be ( if there is one) and how could I fix it? Also my friend did mention i could be overboosting and not even know it. So can someone please shed some light.