My 07 HR for some reason has vibration at 1200-1500 rpms. It does it if the clutch is in or not. It doesn't make any different of a sound other than a low tone that you feel more than hear.kinda like a rumble. The colder it is when start it the more apparent it is. My car is completely stock btw. Any ideas?

 

low tones come from slower vibrations, ie bigger parts.

Id check the motor mounts and the trasn mounts.

Not teling us what part of the car the sound comes from and where you are and how fast you are going when u experience this doesnt help out much haha.

 

It's when I'm not moving it's most apparent. I also forgot to mention I hit a truck tire tread on the interstate going about 80mph. It ripped the liner halfway off and messed up the lip. I'll get it checked out asap.

 

Check this thread my friend: https://my350z.com/forum/vq35hr-479/