Ok I'm having a problem with my E99 I just put in new up pipes, exhaust manifolds, eb sensor and tube, and a 4"turbo back mbrp exhaust. From all of this I was expecting a pleasant power and boost increase however the truck seems to fall flat on its face now. And to add to the frustration I have this sound when the truck is building boost that sounds like a fan hitting plastic. It is very apparent when I'm up around 10psi or 2200rpm. I checked all of the IC boots and they all seem tight. I can't seem to mimic this sound with the truck in park revving the motor. Any ideas would be greatly appreciated.
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