I had some very anoying vibrations,and or rumbling noises that were
hard to find, and I thought I would share what I found with the
group. These aren't the noises I spoke about earlier with the
muffler,but they sent a resonance thru the car at certain rpm's.
#1,Check those little "rubber-bumpers" on the bottom of air-cleaner
housing,sometimes they fall out! #2 also check the mounts on filter,
when bad,they can cause a rumble that can be hard to find. #3 On the
sedan especially, check the "REAR_MOUNT!" #4 Those dust or water
shields for the starter-and or clutch side,can rub or vibrate. Tell
me if you know of more,as I hate Noises! Riceburner006.