I've got levelzero motorsports polyurethane engine mounts. As far as I know factory clutch and flywheel..

The whole car vibrates around +-3k rpm.. could it be something wrong in the clutch flywheel assembly? When I first got the engine mounts there was no shake, it randomly showed up.. The car has jumped up to 230rwhp maybe something failed. I have taken the front cover off for a oil leak once. But if I didnt put the bearing in properly im sure the problem would be worse?

 

What is the condition of the transmission mounts? U-joints are ok?

 

Maybe it's speed related than rpm related? A messed up clutch assembly will give you problems throughout rpm range not just 3k. Not engaging , grinding, slipping, whining would be some problems.
Maybe you need an alignment or wheel balancing.

 

Transmission mounts could be factory, and U joints. Never changed by me atleast.

Wouldn't that be out of the question? Because I can rev the car in neutral and stationary, and still have the same vibration.

 

I'd check the front pulley and the bolts Travis...and since you said you had the cover off,I would be looking in that area to for anything out of the ordinary.

 

I was afraid of that! Not looking forward to that at all.. Especially when it comes to getting the pulley bolt off.. Only method that worked for me was clutch in and permanently in, with a bar and socket hitting the ground, turn the motor and bolts loose.. Not doing that again. Didn't like it. What's the best way?