I know this is talked to death, but I couldn't find a specific clip with the noise my car is makeing. I recently added a grimmspeed tmic and q300 catback. My other mods are a Cobb sf Intake, Cobb ebcs, Cobb fuel pump, Cobb catted downpipe. My target boost is 20psi. I was also told by my tuner that my I hectors were basically maxed. I already have an appointment to have id1050's installed in 2 weeks. When I build up.boost I get a sound that I think is compressor surge when I let off the throttle. I'm posting the clip of the sound my car makes if someone could let me know.