Took the s2k out on a spirited mountain run today, lots of high revs, lots of 2nd to 3rd back to 2nd shifts. A nice workout. All seemed good, ran strong, no issues at all, brand new fluids all around with a clutch pedal adjustment as well. Upon returning home after some highway driving and pulling onto a side street and letting it rev down in 2nd I noticed a pretty significant buzz. Very loud and very noticeable from what seemed like was coming from the clutch pedal and not center transmission tunnel (but obviously that can be hard to tell in the moment). I immediately thought maybe the nut came loose on the clutch adjustment and was buzzing or something, but seemed tight and fine. At the time I continued driving and was unable to replicate it at all, everything back to normal. Any ideas?

 

Do you have an aftermarket clutch disc in the car?

Thanks!

 

Sorry I should've mentioned the set up and mileage. All stock 2005, ~105k miles, owned since 60k but mostly sure it's the original clutch.

And I found this video which seems very similar. Someone also mentioned the same noise after heavy driving so I found that interesting. A couple people saying TCT, which I replaced mine with Billmans about 100 miles ago.

 

Lift the car and check for an oil cap sitting on top of the transmission, particularly if the cap on your car is not OEM. You have to look from underneath the car to see the top of the transmission. Damned thing can make a helluva racket!

 

You might have some clutch buzz but I think the rattling noise is something, probably in your interior, vibrating.