first things first. i have the K&N CIA FIPK. Gibson 3'' exhaust. my drive shaft center bearing was obliterated and i replace the entire rear drive shaft with the fort wayne clutch shaft. and the vibrations under 50mph vanish. i get a rough idle but thats probably because of the mods and i see my bank 1 o2 sesnor jumps around. my issue is that i still get a noticeable vibration above 55mph. i mean i can feel it in the driver seat. the driver door (put my foot or hand on the door.) and steering wheel a little bit. any ideas guys? or any good testing methods for front wheel bearings / alignment / balanced wheels? im going to replace the front drive shaft u joints next month because they are OEM.