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I had exactly the same problem with my Primera - after fitting a custom de-cat front pipe I'd get an awful vibration at around 2000rpm.  It was especially annoying as 2000rpm was just about the revs you'd be at when cornering!


It turned out that the rear O2 sensor was sticking up at an angle, and the tip (well the plug) was actually resting on the chassis.  It didn't matter at all at normal use, except once the engine was hot and at 2000rpm when the exhaust would tap it like a woodpecker against the chassis.  Very embarrassing with an exhaust made for a deep, bassy growl.


My experience certainly supports the theory that SOMEthing is touching the chassis, probably the exhaust or something else subject to engine vibrations.  Otherwise the obvious candidates are the exhaust heat shields either on the underside of the car or above the manifold.


In my K12 I also had the jack shaking about the spare wheel well, but it was nothing like as bad as the O2 sensor sound.  I just took them out of the well and stuck them snug behind my sub enclosure ;)


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