[bmwarg]

Hi, I recently had catless DPs installed and then started hearing what I thought was the wastegate rattle, so I took it to the dealership and they replaced the turbos under warranty and also replaced all vacuum lines. However, I still hear a rattle around 2500 to 3200 rpm when accelerating and the engine is cold. Car is currently running stock so the JB4 or backend flash wasn't the cause. I think DPs were installed correctly because initially when they weren't I could feel rattling when turning and could even feel it in the steering wheel.

Is this noise I hear the wastegate rattle or something related to the catless DPs or something else altogether? One posting said it was loose bolts on the propshaft centre bearing, could this be related to DP or turbo install?

[JuniorMint335]

Is it similar to this sound at 1:40? The video is from a E46 M3 but I just wanted to pick out the sound.

I currently have this issue on my E92 and most noticeable between 2000-3000 rpm. I researched alot of this rattling sound and most E92 owners are pointing to Rod bearing failure. I really hope that its something else, so I am taking the car in on Friday to have it diagnose. Hopefully your situation is different.

[bmwarg]

No different sound. That sounds pretty awful. :-(

Sounds is similar to this youtube video:

[bmwarg]

looks like it could be the wastegate duty cycle (even though I'm completely stock except downpipes right now): http://www.e90post.com/forums/showth...=971346&page=2