My Z Sounds Like a Diesel
 

Just as the title states, my z sounds like a diesel at idle. I’ve noticed this issue start about 3 weeks ago and I typically hear it once I’m idling after driving the car for about 30 minutes. I have not heard it after first starting the car for the day. I can not hear the sound coming from the engine (at least I think I don’t) and I mainly hear it in the cabin. I did a walk around and noticed I could hear it mainly coming out of my right exhaust pipe. I have a motordyne shockwave and had never had issues so far. Any help or ideas would be great.

Probably have an exhaust leak somewhere.

Sounds like a exhaust leak possibly at the exhaust manifold area.

Just stumbled across this thread, mine started doing the exact same thing a few months back when it was extremely cold here in Ohio. Took it to a dealership and they claimed they couldn't hear the sound. When I'm sitting in the car, the sound appears to come from the front passenger side of the vehicle but when you are outside the car and listening in the engine bay you can't hear it at all. I've got Berk HFC's and HKS catback on mine. Please post back if you figure it out and I will do the same. Thanks!

If you do find the fix for this definitely post it up.

Just wanted to post some samples of it.

Harder to hear from this video inside the car but if you turn it up you should hear it distinctly:



And I actually noticed this week from the passenger side tailpipe when I walked behind the car while it was idling:



That same noise is not in the driver side tailpipe at all.