I would also retighten all the nuts and bolts on the exhaust. I had one bolt come totally undone and after tightening everything up, the only real noise is from light weight flywheel.

Gonna try Rangerz's method first cuz I don't have jack stand (i feel unsafe to crawl under the car on my own..). If it doesn't solve, I may go back to the installer and figure out where the buzz come from.

Is that the odd noise that goes away when I push the clutch in? If so, it's the noisiest single aspect of any car I've ever had, not counting things that are supposed to be noisy (engine/exhaust sounds).

I think this noise comes stock. Just get a loud exhaust setup. I always notice it before, now I simply can't hear it anymore.

mine vibrates on cold start. i have a little "dynomat" too. i wouldn't say i have any drone driving on the highway though. maybe if the rpms were at 2k..

Yup, it will rattle at very low RPMs when in first or second gear and you are at a slow roll....

Hey oH,

When I did that vid I think knocked off the foam where the bottom plastic connects to the upper portion. For me the major source of the BUZZ. I re did mine at that connection and it's gone. H2O doc said he used felt I think that would work well too for that joint.

let us know if that hooks you up.:tiphat:

So....first of all thanks guys for all of your inputs. I'm back with my results

Special thanks to RangerZ. But unfortunately it didn't solve the problem.

So I took that piece of panel off and tried, still had buzz.

Then I took all the panels off hatch door (the piece I foamed up and the u-shape pieces behind it). The buzz was still there.

So now I'm stuck clueless. Anymore inputs? I did nail the rpm range to >1.8k and <2.3k

Video coming right up~

Here comes the sound clip. By the way I didn't try to control the rpm in this video. If I control it to be in the "buzzing" zone, it can and will buzz all day long. Gets even louder after pipes are warmed

Yea thats not what my rattle sounded like. It almost sounds like the lisence plate. All the tools are nice and tight? Cubby behind passenger seat empty etc... sorry man. Can you get somebody to ride along with you at the buzz rpm and push on different panels, parts etc to narrow it down. Just guessing here

yeah. I think that's what I'm planning to do. But I wasn't expecting to do that today....

So with my friend's help I think I pinpointed the buzzing from the hatch lock. I taped my cellphone onto the metal piece which is securing the lock in place and I think I found that to be the piece rattling/buzzing. I took it off and kinda fabricated some "dynamat" from my old mouse pad, pulled some holes on it and put it behind the metal piece to prevent it from touching car's metal cabin. Hopefully the buzzing will be gone because I broke a screw driver and my hands are full of calluses from all the untightening and tightening.

I get a seldom dash vibration when the rpms get around 4k at full throttle. Besides that its all good. I have the 18" resonators on my FI exhaust.

Confirm problem fixed:tup:now I get a very mild "mouse pad" flappy sound. very easy ignored.:rofl2:

yes I have this too. Those are easily covered by a little music. although I usually make my music loud

Well I'm glad you were able solve your problem, but now I have one. I was thinking of getting the FI exhaust but with what it seems like a common problem of rattles hissing and unknown noises I'm a little hesitant. I've gotten exhausts on other cars and never had problems with them. These are special made for the Z and come from the factory with these issues puts pause in me. Other than the noise do you like the exhaust , sound and power?